{"id":6738,"date":"2026-04-11T14:49:17","date_gmt":"2026-04-11T14:49:17","guid":{"rendered":"https:\/\/couleenergy.com\/?p=6738"},"modified":"2026-04-11T14:49:23","modified_gmt":"2026-04-11T14:49:23","slug":"technologie-des-cellules-dli-et-plafond-dombrage-ce-que-toute-equipe-dapprovisionnement-agrivoltaique-devrait-savoir-en-2026","status":"publish","type":"post","link":"https:\/\/couleenergy.com\/fr\/dli-cell-technology-and-the-shading-ceiling-what-every-agrivoltaic-procurement-team-should-know-in-2026\/","title":{"rendered":"DLI, technologie cellulaire et plafond de saturation\u00a0: ce que chaque \u00e9quipe d\u2019approvisionnement agrivolta\u00efque devrait savoir en 2026"},"content":{"rendered":"\n<p>Solar panels and crops used to compete for the same land. Today, they work together on it. Agrivoltaic solar systems place photovoltaic panels above growing crops \u2014 generating electricity while the farm below keeps producing food. The idea sounds simple. Getting it right takes science.<\/p>\n\n\n\n<p>This guide explains how agrivoltaic systems work, what recent research says about shading and crop yields, why panel cell technology matters more than most buyers realize, and how to choose the right transparent solar panel for your specific project.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Is Agrivoltaic Solar?<\/h2>\n\n\n\n<p>Agrivoltaics \u2014 sometimes called agri-PV or dual-use solar farming \u2014 is the practice of growing crops and generating solar electricity on the same piece of land at the same time. Elevated solar panels sit above the crop canopy, typically mounted 2 to 4 meters high to allow machinery access. The panels intercept some sunlight. The crops below receive what passes through.<\/p>\n\n\n\n<p>This is not a compromise. It is a design choice. Most crops do not need every photon of sunlight that reaches them. Beyond a certain light level \u2014 called the light saturation point \u2014 extra sunlight does not help a plant grow. It just creates heat stress and increases water demand.<\/p>\n\n\n\n<p>Agrivoltaic systems capture the surplus light, convert it to electricity, and cool the growing environment below. Done correctly, both the crop and the solar yield win.<\/p>\n\n\n\n<p><strong>Key concept:<\/strong>&nbsp;Agrivoltaic solar is not about taking light away from crops. It is about using the light that crops cannot use \u2014 and doing something productive with it.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Agrivoltaics Is Growing Fast<\/h2>\n\n\n\n<p>Land is the bottleneck for both food production and renewable energy. Conventional utility-scale solar farms compete directly with agricultural land, and that conflict is driving policy friction worldwide. Agrivoltaics resolves it.<\/p>\n\n\n\n<p>Research consistently shows that agrivoltaic systems outperform single-use land. Most studies find 20\u201380% greater combined land-use efficiency, measured by Land Equivalent Ratio values between 1.2 and 1.8, with some studies in optimal arid conditions reporting gains up to 200%.<sup>[1]<\/sup>\u00a0<strong>Water savings are also significant.<\/strong>\u00a0Agrivoltaic systems typically improve crop water-use efficiency by 20\u201347% across diverse climates, with some cross-study reviews documenting irrigation demand reductions of around 14%.<sup>[1][13]<\/sup><\/p>\n\n\n\n<p>The microclimate benefits extend beyond water. Panels reduce the direct heat load on crops. University of Arizona research from 2025 found that agrivoltaic shading lowered wet bulb globe temperatures \u2014 the measure of extreme heat risk \u2014 by up to 9.9\u00b0F compared to open-air farms.<sup>[2]<\/sup>\u00a0That is significant not just for crops, but for the farmworkers tending them.<\/p>\n\n\n\n<p>Cornell University researchers published new findings in April 2026 showing that solar panel rows in agrivoltaic arrays also act as windbreaks. Wind erosion costs U.S. agriculture an estimated $9 billion annually.<sup>[3]<\/sup>\u00a0Properly designed agrivoltaic structures can reduce that damage \u2014 an entirely unexpected co-benefit that is only now being studied in depth.<\/p>\n\n\n\n<p>Ecological gains show up too. Iowa State University found that intentionally adding native perennial flowering vegetation to an agrivoltaic site increased honey production from managed bee colonies by 412% \u2014 without interfering with energy generation or farming operations.<sup>[4]<\/sup>\u00a0The gain required deliberate habitat design, not solar panels alone. Biodiversity, soil health, and pollinator activity all improve when site management is planned around ecological co-benefits.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The Make-or-Break Variable: Shading Level<\/h2>\n\n\n\n<p>Every agrivoltaic project lives or dies on one number: how much light the panels transmit to the crop below. Too much shade and yields fall. Too little and you lose solar output.<\/p>\n\n\n\n<p>Panel transmittance and shading percentage are two sides of the same number. A panel at 70% transmittance creates 30% shading. Lock down this number before you order a single panel.<\/p>\n\n\n\n<p>A February 2026 Nature study synthesizing field crop research across multiple geographies established a working rule:\u00a0<strong>shading up to 20\u201330% generally has little or no negative impact on most crops.<\/strong><sup>[5]<\/sup>\u00a0Above 30%, yield losses become likely and accelerate quickly.<\/p>\n\n\n\n<p>Japan&#8217;s national agrivoltaic policy reflects the same threshold. It requires that crop yields not fall by more than roughly 20% compared to the regional average.<sup>[6]<\/sup>\u00a0France applies a stricter standard: its 2023 agrivoltaic decree limits approved configurations to those achieving less than a 10% yield reduction \u2014 or demonstrating a quality improvement in the harvested product.<sup>[14]<\/sup>\u00a0For European project developers, France&#8217;s threshold is the more demanding design target.<\/p>\n\n\n\n<p>A 2026 University of Illinois study published in PNAS added important regional nuance. Climate drives outcomes as much as shading level does. In humid eastern Midwest conditions, solar shading reduced maize yields by 24% and soybean yields by 16%. In semi-arid parts of the same region, shading alleviated water stress and actually increased soybean yields.<sup>[7]<\/sup>\u00a0The same panel design produced opposite economic outcomes depending on local aridity.<\/p>\n\n\n\n<p><strong>Rule of thumb:<\/strong>&nbsp;In arid and semi-arid climates, agrivoltaics typically boosts performance. In humid climates, careful shading management is critical. Know your climate before you set your transmittance target.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\" style=\"margin-top:var(--wp--preset--spacing--60);margin-bottom:var(--wp--preset--spacing--60)\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"Learn about Agrivoltaic Microclimates and their Impacts on Vegetables\" width=\"1778\" height=\"1000\" src=\"https:\/\/www.youtube.com\/embed\/mXoSnNj2vnA?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Crop-by-Crop Shading Guide: What the Research Shows<\/h2>\n\n\n\n<p>Shading tolerance varies significantly by crop. Below are research-backed safe shading ceilings and minimum Daily Light Integral (DLI) requirements for four key crops, drawn from peer-reviewed studies published in 2024\u20132026.<sup>[5][8][9]<\/sup><\/p>\n\n\n\n<figure style=\"margin-top:var(--wp--preset--spacing--60);margin-bottom:var(--wp--preset--spacing--60)\" class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Crop<\/th><th class=\"has-text-align-left\" data-align=\"left\">Safe Shading Ceiling<\/th><th class=\"has-text-align-left\" data-align=\"left\">Panel Transmittance<\/th><th class=\"has-text-align-left\" data-align=\"left\">Min DLI (mol\/m\u00b2\/day)<\/th><th class=\"has-text-align-left\" data-align=\"left\">Key Risk<\/th><\/tr><\/thead><tbody><tr><td>Rice<\/td><td>\u2264 27%<\/td><td>73\u201380%<\/td><td>\u2265 12<\/td><td>Reduced panicle count in vegetative stage<\/td><\/tr><tr><td>Soybean<\/td><td>\u2264 30%<\/td><td>70\u201380%<\/td><td>\u2265 14<\/td><td>Strong shade-avoidance response; choose tolerant cultivars<\/td><\/tr><tr><td>Sweet Potato<\/td><td>\u2264 20%<\/td><td>80%+<\/td><td>\u2265 16<\/td><td>Most shade-sensitive; organic cultivation worse<\/td><\/tr><tr><td>Tomato (greenhouse)<\/td><td>~50% (mono-Si only)<\/td><td>50% (PV-Si)<\/td><td>\u2265 18 (winter)<\/td><td>CdTe thin-film fails minimum DLI in winter<\/td><\/tr><tr><td>Potato<\/td><td>\u2264 13\u201315%<\/td><td>85\u201390%<\/td><td>\u2265 14<\/td><td>Tuber size shifts smaller above 30% shading; moderate shade improves WUE<\/td><\/tr><tr><td>Leafy greens (lettuce, spinach)<\/td><td>\u2264 40\u201350%<\/td><td>50\u201360%<\/td><td>\u2265 10\u201312<\/td><td>Among highest shade-tolerance; heat stress during summer often reduced under panels<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><em>Potato data: Catholic University of the Sacred Heart \/ Smart Agricultural Technology, 2026 \u2014 four-year Italian field trial. Leafy greens data: Barron-Gafford et al., Nature Sustainability 2019, and multiple greenhouse agrivoltaic trials. Contact Couleenergy for crop-specific transmittance guidance on additional crops including grape, strawberry, maize, and cannabis.<\/em><\/p>\n\n\n\n<p><strong>Rice<\/strong>&nbsp;is the most shade-tolerant staple crop studied. It shows no significant yield reduction under 27% shading. It compensates for any vegetative-stage shading by producing more spikelets per panicle later in the season.<\/p>\n\n\n\n<p><strong>Soybean<\/strong>\u00a0has a hard safety ceiling near 30% shading, established by the Nature 2026 synthesis. A separate 2024 ScienceDirect study found that soybean yield dropped by 31% under 33% shading \u2014 confirming how quickly performance falls once that ceiling is breached. The same 2024 study also found that semi-transparent panels at 40% transmittance \u2014 meaning 60% shading \u2014 can still maintain yield and quality, provided you select shade-tolerant cultivars.<sup>[9]<\/sup>\u00a0The shade-avoidance response in soybean causes stem elongation and reduced branching, so cultivar choice matters enormously.<\/p>\n\n\n\n<p><strong>Sweet potato<\/strong>&nbsp;is the most light-sensitive crop in recent agrivoltaic research. Yield decreased linearly with shading. Even 20% shading caused decline in some cultivars. Organic cultivation under agrivoltaic structures showed even steeper losses of 42\u201349%. If you are growing sweet potato under solar, select cultivars bred for lower shade-avoidance response \u2014 the Japanese varieties Amahazuki and Silksweet both performed better in trials.<\/p>\n\n\n\n<p><strong>Tomato<\/strong>&nbsp;results depend almost entirely on cell technology. See the next section.<\/p>\n\n\n\n<p><strong>Potato<\/strong>&nbsp;is a globally important crop that has received growing research attention in agrivoltaics. A four-year Italian field trial published in Smart Agricultural Technology (2026) found that low seasonal shading of around 13% produced limited yield penalties averaging just 12%. Shading above 30%, however, caused reductions exceeding 30% and a consistent shift toward smaller tubers. Importantly, even moderate shading delayed soil-moisture depletion, extended biomass accumulation, and improved water-use efficiency \u2014 making potato a viable candidate in high-irradiance regions where heat and drought are the primary yield constraints.<\/p>\n\n\n\n<p><strong>Leafy greens<\/strong>&nbsp;\u2014 lettuce, spinach, and similar crops \u2014 are among the most shade-tolerant categories in agrivoltaic systems. They can perform well under 40\u201350% shading, particularly in high-summer conditions where unshaded heat stress is the bigger yield threat. Research at Jack&#8217;s Solar Garden in Colorado found lettuce fresh weight increased significantly under panels during hot periods compared to the open-field control. High-transmittance panels are not required; 50\u201360% transmittance panels are appropriate and maximise dual-use energy output.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Cell Technology Changes Everything: The DLI Lesson<\/h2>\n\n\n\n<p>Transmittance percentage is not the whole story. A landmark April 2026 study from IMIDA Spain \u2014 published in Smart Agricultural Technology \u2014 tested two greenhouse panels with identical 50% transmittance ratings.<sup>[10]<\/sup>\u00a0One used monocrystalline silicon (PV-Si). The other used cadmium telluride thin-film (CdTe\/PV-TF). The results were striking.<\/p>\n\n\n\n<figure style=\"margin-top:var(--wp--preset--spacing--60);margin-bottom:var(--wp--preset--spacing--60)\" class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Technology<\/th><th class=\"has-text-align-left\" data-align=\"left\">Winter DLI (mol\/m\u00b2\/day)<\/th><th class=\"has-text-align-left\" data-align=\"left\">Summer DLI (mol\/m\u00b2\/day)<\/th><th class=\"has-text-align-left\" data-align=\"left\">Energy Output (2 seasons)<\/th><\/tr><\/thead><tbody><tr><td>PV-Si Monocrystalline<\/td><td>18.1<\/td><td>25.4<\/td><td>726.8 kWh<\/td><\/tr><tr><td>PV-TF (CdTe thin-film)<\/td><td>10.8<\/td><td>17.0<\/td><td>488.4 kWh<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Both panels had the same transmittance number on the spec sheet. But PV-Si delivered 67% more DLI in winter. The difference lies in panel construction, not a simple spectral rule. Standard monocrystalline silicon panels are spatially segmented: opaque cell rows alternate with strips of transparent solar-grade glass that transmit full-spectrum light directly to the crop canopy. The CdTe thin-film panels in the IMIDA study achieved transparency by thinning the absorber layer \u2014 a different optical mechanism that resulted in lower effective PAR delivery at canopy level, particularly in the low-irradiance winter months when ambient light is already limited.<\/p>\n\n\n\n<p>The crop outcome was decisive. PV-Si tomatoes weighed 25% more than the unshaded control in winter-spring. CdTe panels dropped DLI below the minimum threshold for optimal development during that same season. PV-Si also generated 49% more electricity than PV-TF over the two-season trial.<\/p>\n\n\n\n<p><strong>Critical takeaway:<\/strong>&nbsp;Two panels with the same transmittance % can deliver radically different results for your crop. Specify cell technology \u2014 not just transmittance \u2014 when ordering agrivoltaic panels.<\/p>\n\n\n\n<p>Daily Light Integral (DLI) is the number that ties it together. DLI measures total photosynthetically active radiation over a full day, in mol\/m\u00b2\/day.<sup>[11]<\/sup>\u00a0It accounts for seasonal variation in ambient light in a way that a fixed transmittance percentage cannot. A panel that delivers enough DLI in July may fall short in December. Design around seasonal DLI requirements, not annual averages.<\/p>\n\n\n\n<p><strong>The IMIDA data shows cell technology matters as much as transmittance.<\/strong><br>Couleenergy supplies monocrystalline, TOPCon, and HJT transparent panels at your specified transmittance level. Request a technical datasheet or sample order for your crop and climate.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Dual-Glass vs Transparent Backsheet: Choosing Your Construction<\/h2>\n\n\n\n<p>Transparent solar panels for agrivoltaics come in two main construction types. The right choice depends on your structure, climate, and installation priorities.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Dual-Glass (Glass-Glass) Panels<\/h3>\n\n\n\n<p>Dual-glass agrivoltaic panels use glass on both the front and rear surfaces. They deliver fire resistance, excellent humidity tolerance, and lifespans exceeding 30 years. Both surfaces carry high optical transmittance, and bifacial variants capture reflected light from below. These suit permanent greenhouse roofs and open-field agrivoltaic structures where long-term durability matters most. The tradeoff is weight \u2014 glass-glass panels are heavier, adding load to support structures and shipping costs.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Transparent Backsheet Panels<\/h3>\n\n\n\n<p>Transparent backsheet panels replace rear glass with a high-performance transparent polymer. They are significantly lighter than dual-glass, reducing structural loads and transport costs. The polymer dissipates heat more effectively, which helps maintain lower operating temperatures in hot climates. Two specific advantages stand out: UV transmittance below 1% (versus 40\u201350% for standard glass), which matters for crops where UV exposure drives stress responses; and superior resistance to saline-alkali conditions, making them the better choice for coastal or salt-affected soil sites.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\" style=\"margin-top:var(--wp--preset--spacing--60);margin-bottom:var(--wp--preset--spacing--60)\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/couleenergy.com\/wp-content\/uploads\/2026\/01\/where-to-buy-custom-transparent-solar-panels-1024x1024.jpg\" alt=\"where to buy custom transparent solar panels\" class=\"wp-image-6472\" srcset=\"https:\/\/couleenergy.com\/wp-content\/uploads\/2026\/01\/where-to-buy-custom-transparent-solar-panels-1024x1024.jpg 1024w, https:\/\/couleenergy.com\/wp-content\/uploads\/2026\/01\/where-to-buy-custom-transparent-solar-panels-300x300.jpg 300w, https:\/\/couleenergy.com\/wp-content\/uploads\/2026\/01\/where-to-buy-custom-transparent-solar-panels-150x150.jpg 150w, https:\/\/couleenergy.com\/wp-content\/uploads\/2026\/01\/where-to-buy-custom-transparent-solar-panels-768x768.jpg 768w, https:\/\/couleenergy.com\/wp-content\/uploads\/2026\/01\/where-to-buy-custom-transparent-solar-panels-12x12.jpg 12w, https:\/\/couleenergy.com\/wp-content\/uploads\/2026\/01\/where-to-buy-custom-transparent-solar-panels-500x500.jpg 500w, https:\/\/couleenergy.com\/wp-content\/uploads\/2026\/01\/where-to-buy-custom-transparent-solar-panels-600x600.jpg 600w, https:\/\/couleenergy.com\/wp-content\/uploads\/2026\/01\/where-to-buy-custom-transparent-solar-panels-100x100.jpg 100w, https:\/\/couleenergy.com\/wp-content\/uploads\/2026\/01\/where-to-buy-custom-transparent-solar-panels.jpg 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to Specify the Right Agrivoltaic Panel<\/h2>\n\n\n\n<p>Choosing a transparent solar panel for agriculture is not like choosing a standard rooftop panel. You are matching a panel specification to agronomic requirements. Here is a practical decision framework.<\/p>\n\n\n\n<p><strong>Step 1 \u2014 Set your DLI target.<\/strong>&nbsp;Most vegetables and fruiting crops need 12\u201320 mol\/m\u00b2\/day minimum. Leafy greens can work with 10\u201312. High-light crops like tomatoes prefer 20+. Find your crop&#8217;s threshold.<\/p>\n\n\n\n<p><strong>Step 2 \u2014 Check local ambient DLI by season.<\/strong>&nbsp;A 50% transmittance panel in southern Spain in July still delivers ample DLI. The same panel in northern Germany in December likely falls short. Use seasonal DLI data for your location, not annual averages.<\/p>\n\n\n\n<p><strong>Step 3 \u2014 Apply the 20\u201330% shading ceiling.<\/strong>&nbsp;For most field crops, stay at or below 30% shading. That means panels at 70%+ transmittance for light-sensitive crops. For shade-tolerant crops in high-light climates, 50\u201360% transmittance can work.<\/p>\n\n\n\n<p><strong>Step 4 \u2014 Specify monocrystalline cell technology.<\/strong>&nbsp;For greenhouse tomatoes or any winter-season crop, monocrystalline silicon \u2014 including TOPCon and HJT variants \u2014 has demonstrated measurably higher effective PAR delivery at canopy level in field trials. Panel construction, not just transmittance percentage, drives this outcome. Do not substitute thin-film and expect the same crop result.<\/p>\n\n\n\n<p><strong>Step 5 \u2014 Choose your construction type.<\/strong>&nbsp;Dual-glass for permanent, heavy-duty installations. Transparent backsheet for lighter structures, retrofits, or saline environments.<\/p>\n\n\n\n<p><strong>Step 6 \u2014 Match dimensions to row spacing.<\/strong>&nbsp;Shading is not just a panel number. It depends on how much of the canopy sits under the panels at any given time. Panel width, row pitch, and mounting height all affect the shading pattern on the ground.<\/p>\n\n\n\n<p><strong>Available specifications from Couleenergy:<\/strong><br>Transmittance levels: 30% \/ 40% \/ 45% \/ 50% \/ custom<br>Cell types: BC \/ TOPCon \/ HJT<br>Construction: Dual-glass or transparent backsheet<br>Custom dimensions \u00b7 Framed or frameless \u00b7 OEM available<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Is Agrivoltaics Always Worth It?<\/h2>\n\n\n\n<p>Honestly, no \u2014 not in every case. The 2026 University of Illinois PNAS study is important here. In humid eastern Midwest conditions, agrivoltaic shading reduced soybean and maize yields significantly. High installation costs for elevated solar arrays can further reduce economic competitiveness relative to stand-alone solar, particularly without policy support.<sup>[12]<\/sup><\/p>\n\n\n\n<p>Agrivoltaics works best when at least one of these conditions applies: the climate is arid or semi-arid; the crop benefits from heat stress reduction; irrigation savings are meaningful; or the land value makes dual-use economically compelling. In cool, humid climates with moderate solar irradiance, a careful feasibility study matters before commitment.<\/p>\n\n\n\n<p>That said, for high-value crops in high-light climates, the evidence is increasingly strong. The IMIDA Spain research showed monocrystalline silicon panels actually producing tomatoes heavier than the unshaded control \u2014 not just maintaining yield, but improving it. The agrivoltaic system managed heat and moisture better than open air. That outcome is possible. Getting there requires the right panel specification.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">FAQ<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">What is the best panel transmittance for agrivoltaics?<\/h3>\n\n\n\n<p>It depends on crop and climate. For most field crops, panels at 70\u201380% transmittance (20\u201330% shading) are the safe starting range. For shade-tolerant crops in high-light climates, 50% transmittance monocrystalline panels can work well. Always verify against your crop&#8217;s minimum DLI requirement by season.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Does cell technology matter as much as transmittance?<\/h3>\n\n\n\n<p>Yes \u2014 the 2026 IMIDA Spain study proved it conclusively. Monocrystalline silicon at 50% transmittance delivered 67% more DLI in winter than CdTe thin-film at the same rating. Specify cell type, not just transmittance percentage.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can agrivoltaic panels reduce water use?<\/h3>\n\n\n\n<p>Yes. Research typically finds crop water-use efficiency improvements of 20\u201347% across diverse climates, with irrigation demand reductions of around 14% documented in cross-study reviews. In some individual studies under extreme arid conditions, higher figures have been reported. Partial shading reduces evapotranspiration and keeps soil moisture higher throughout the day.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What is DLI and why does it matter?<\/h3>\n\n\n\n<p>DLI (Daily Light Integral) is the total photosynthetically active radiation a crop receives over a full day, measured in mol\/m\u00b2\/day. It is more useful than shading percentage because it accounts for seasonal changes in ambient light. A panel that passes enough DLI in summer may fall short in winter. Design around seasonal DLI, not annual averages.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Are dual-glass panels better than transparent backsheet panels?<\/h3>\n\n\n\n<p>Neither is universally better. Dual-glass offers longer lifespan and fire resistance for permanent installations. Transparent backsheet panels are lighter, manage heat better, and resist saline environments \u2014 better for retrofit projects or coastal sites.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How do I order a sample or get a custom quote from Couleenergy?<\/h3>\n\n\n\n<p>Contact Couleenergy directly at\u00a0info@couleenergy.com\u00a0or call +1 737 702 0119. Sample orders for pre-installation testing are supported, as are full project quotes based on your transmittance level, cell technology, panel dimensions, and construction type. OEM and white-label manufacturing is also available for trade buyers and integrators. Share your crop type, project location, and target transmittance \u2014 and the technical team can advise on the right specification before you commit to an order.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Footnotes<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Pandey G. et al., &#8220;A systematic review of agrivoltaics: productivity, profitability, and environmental co-benefits,&#8221;\u00a0<em>Sustainable Production and Consumption<\/em>, Vol. 56, 2025, pp. 13\u201336 (Elsevier). Reports land-use efficiency up to 200% and irrigation demand reduction of 14% in AVS vs conventional systems. Note: the 200% figure represents a reported maximum under optimal arid conditions; typical LER-based gains across the literature are 20\u201380% (see also [13]).\u00a0<a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S2352550925000569\" target=\"_blank\" rel=\"noreferrer noopener\">sciencedirect.com<\/a><\/li>\n\n\n\n<li>Neesham-McTiernan T., University of Arizona, presented at American Geophysical Union Annual Meeting 2025; reported via ASCE Civil Engineering Source, March 2026. Wet bulb globe temperature (WBGT) reductions of up to 9.9\u00b0F measured at Jack&#8217;s Solar Garden agrivoltaic farm, Longmont, Colorado.\u00a0<a href=\"https:\/\/www.asce.org\/publications-and-news\/civil-engineering-source\/article\/2026\/03\/02\/agrivoltaics-how-combining-solar-panels-and-farming-delivers-big-benefits\" target=\"_blank\" rel=\"noreferrer noopener\">asce.org<\/a><\/li>\n\n\n\n<li>Sibley School of Mechanical and Aerospace Engineering, Cornell University, &#8220;Agrivoltaics wind shelter benefits with single-axis tracking solar panels,&#8221;\u00a0<em>Agricultural and Forest Meteorology<\/em>, April 2026. Wind erosion figure ($9B\/yr) sourced from the study&#8217;s U.S. agricultural damage estimate.\u00a0<a href=\"https:\/\/cleantechnica.com\/2026\/04\/05\/agrivoltaics-can-save-us-farmers-in-more-ways-than-one\/\" target=\"_blank\" rel=\"noreferrer noopener\">cleantechnica.com<\/a><\/li>\n\n\n\n<li>O&#8217;Neal M. et al., Iowa State University \/ Alliant Energy Solar Farm agrivoltaics research; reported via ASCE Civil Engineering Source, March 2026. A 412% rise in honey production was achieved by adding native perennial flowering vegetation to the agrivoltaic site \u2014 the gain required deliberate pollinator habitat management alongside the solar installation, not co-location with panels alone.\u00a0<a href=\"https:\/\/www.asce.org\/publications-and-news\/civil-engineering-source\/article\/2026\/03\/02\/agrivoltaics-how-combining-solar-panels-and-farming-delivers-big-benefits\" target=\"_blank\" rel=\"noreferrer noopener\">asce.org<\/a><\/li>\n\n\n\n<li>Sekiyama T. et al., &#8220;On-farm agrivoltaic impacts on main crop yield,&#8221;\u00a0<em>npj Sustainable Agriculture<\/em>\u00a0(Nature Portfolio), February 2026. Multi-geography synthesis establishing 20\u201330% as the working shading threshold for most crops, with rice, soybean, and sweet potato data.\u00a0<a href=\"https:\/\/www.nature.com\/articles\/s44264-025-00121-w\" target=\"_blank\" rel=\"noreferrer noopener\">nature.com<\/a><\/li>\n\n\n\n<li>Japan Ministry of Agriculture, Forestry and Fisheries (MAFF) agrivoltaic guidelines; benchmark cited in: Cranberry agrivoltaics shading study,\u00a0<em>Frontiers in Horticulture<\/em>, November 2025. Japan policy requires crop yield not fall more than ~20% vs regional average.\u00a0<a href=\"https:\/\/www.frontiersin.org\/journals\/horticulture\/articles\/10.3389\/fhort.2025.1695943\/full\" target=\"_blank\" rel=\"noreferrer noopener\">frontiersin.org<\/a><\/li>\n\n\n\n<li>Jia M. et al., &#8220;Climate-driven divergence in biophysical and economic impacts of agrivoltaics,&#8221;\u00a0<em>Proceedings of the National Academy of Sciences<\/em>, 2026. DOI: 10.1073\/pnas.2514380123. 15-year simulation across Midwest climate zones; maize \u221224%, soybean \u221216% in humid east vs soybean yield gains in semi-arid west.\u00a0<a href=\"https:\/\/phys.org\/news\/2026-03-agrivoltaics-yields-profits-crop-deployed.html\" target=\"_blank\" rel=\"noreferrer noopener\">phys.org<\/a><\/li>\n\n\n\n<li>Sekiyama T. et al.,\u00a0<em>npj Sustainable Agriculture<\/em>, February 2026 (see [5]). Rice: no significant yield loss at \u226427% shading; sweet potato: 40% tuber yield decrease at 31% shading, 42\u201349% decrease under organic cultivation.\u00a0<a href=\"https:\/\/www.nature.com\/articles\/s44264-025-00121-w\" target=\"_blank\" rel=\"noreferrer noopener\">nature.com<\/a><\/li>\n\n\n\n<li>Aroca-Delgado R. et al., &#8220;Agrivoltaics with semitransparent panels \u2014 soybean yield and quality,&#8221;\u00a0<em>Solar Energy<\/em>\u00a0(ScienceDirect), 2024. Semi-transparent panels at 40% solar transmittance maintained soybean yield and quality; 31% yield drop confirmed at 33% shading vs control.\u00a0<a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0038092X2400673X\" target=\"_blank\" rel=\"noreferrer noopener\">sciencedirect.com<\/a><\/li>\n\n\n\n<li>IMIDA (Instituto Murciano de Investigaci\u00f3n y Desarrollo Agrario y Medioambiental), Spain, published in\u00a0<em>Smart Agricultural Technology<\/em>, April 2026; reported via PV Magazine. PV-Si monocrystalline vs CdTe thin-film at identical 50% transmittance: DLI, tomato weight, and energy output comparison across two growing seasons in Murcia, Spain. The DLI difference between technologies is attributed to panel construction: spatially segmented c-Si panels transmit full-spectrum light through transparent glass strips, while the thin-film CdTe design achieves transparency via absorber layer thinning with lower effective PAR delivery at canopy level.\u00a0<a href=\"https:\/\/www.pv-magazine.com\/2026\/04\/06\/how-much-shading-do-agrivoltaics-really-need\/\" target=\"_blank\" rel=\"noreferrer noopener\">pv-magazine.com<\/a><\/li>\n\n\n\n<li>Daily Light Integral (DLI) is the cumulative amount of photosynthetically active radiation (PAR, 400\u2013700 nm) delivered to a surface over a 24-hour period, expressed in mol\/m\u00b2\/day. Reference: Runkle E., &#8220;Daily Light Integral \u2014 Defined,&#8221; Michigan State University Extension \/ Floriculture &amp; Greenhouse Crop Production.\u00a0<a href=\"https:\/\/www.canr.msu.edu\/resources\/daily_light_integral_defined\" target=\"_blank\" rel=\"noreferrer noopener\">canr.msu.edu<\/a><\/li>\n\n\n\n<li>Trommsdorff M. et al., &#8220;Scientific frontiers of agrivoltaic cropping systems,&#8221;\u00a0<em>Nature Reviews Clean Technology<\/em>, November 2025. AV systems are typically 20\u201390% costlier to install than conventional ground-mounted PV, and global electricity potential is estimated at 66\u2013385 PWh annually if deployed in suitable areas.\u00a0<a href=\"https:\/\/www.nature.com\/articles\/s44359-025-00110-9\" target=\"_blank\" rel=\"noreferrer noopener\">nature.com<\/a><\/li>\n\n\n\n<li>Jan W. et al., &#8220;Impacts of agrivoltaic systems on microclimate, water use efficiency, and crop yield: A systematic review,&#8221;\u00a0<em>Renewable and Sustainable Energy Reviews<\/em>, Vol. 221, 2025. Analysis of 33 studies finds WUE improvement of 20\u201347% and air\/soil temperature reductions of 1\u20134\u00b0C across diverse climates. Cross-referenced with: MDPI PRISMA-based systematic review (249 studies, 2010\u20132025), which finds WUE improvements of 15\u201330% in water-stressed regions and LER values of 1.2\u20131.8 (20\u201380% territorial efficiency gain).\u00a0<a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S1364032125006033\" target=\"_blank\" rel=\"noreferrer noopener\">sciencedirect.com<\/a>\u00a0\u00b7\u00a0<a href=\"https:\/\/www.mdpi.com\/1996-1073\/19\/6\/1418\" target=\"_blank\" rel=\"noreferrer noopener\">mdpi.com<\/a><\/li>\n\n\n\n<li>French Decree No. 2023-1408 of 29 December 2023 on the development of agrivoltaics (<em>D\u00e9cret n\u00b0 2023-1408 relatif au d\u00e9veloppement de l&#8217;agrivolta\u00efsme<\/em>). Limits approved agrivoltaic configurations to those where crop yield does not decrease by more than 10%, or where the quality of the agricultural product is demonstrably improved. Referenced in: Efficiency, Sustainability and Governance of Agrivoltaic Systems,\u00a0<em>Energies<\/em>, MDPI, 2026 (249-study PRISMA review).\u00a0<a href=\"https:\/\/www.mdpi.com\/1996-1073\/19\/6\/1418\" target=\"_blank\" rel=\"noreferrer noopener\">mdpi.com<\/a><\/li>\n<\/ol>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-48d0e691 wp-block-buttons-is-layout-flex\" style=\"margin-top:var(--wp--preset--spacing--60);margin-bottom:var(--wp--preset--spacing--60)\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-palette-color-8-color has-text-color has-link-color wp-element-button\" href=\"\/contact\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Custom Project Quote<\/strong><\/a><\/div>\n<\/div>\n\n\n\n<p><strong>Get a Sample, Datasheet, or Custom Project Quote<\/strong><\/p>\n\n\n\n<p>Couleenergy (Ningbo Coulee Tech Co., Ltd.) is a Zhejiang-based solar manufacturer specialising in back-contact and semi-transparent photovoltaic technology. We supply custom-spec transparent panels to greenhouse operators, agrivoltaic integrators, EPC contractors, and OEM partners across Asia, Europe, and beyond.<\/p>\n\n\n\n<p>Tell us your crop, project location, and target transmittance level. We will recommend the right cell technology, construction type, and panel dimensions \u2014 then supply to your exact specification.<\/p>\n\n\n\n<p><strong>Three ways to engage:<\/strong><br>\u2192&nbsp;<strong>Sample order<\/strong>&nbsp;\u2014 test panels at your transmittance target before committing to volume<br>\u2192&nbsp;<strong>Technical datasheet<\/strong>&nbsp;\u2014 full spec sheet for your chosen cell type and construction<br>\u2192&nbsp;<strong>Custom project quote<\/strong>&nbsp;\u2014 dimensions, power output, transmittance, and construction matched to your agronomic requirements<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le pourcentage de transmittance indique la quantit\u00e9 de lumi\u00e8re qui traverse un panneau. Il ne renseigne pas sur la quantit\u00e9 de lumi\u00e8re photosynth\u00e9tiquement utile qui atteint le couvert v\u00e9g\u00e9tal. L&#039;Int\u00e9grale de Lumi\u00e8re Quotidienne (DLI) est le param\u00e8tre qui d\u00e9termine si une culture atteint son seuil de croissance. Sp\u00e9cifier la transmittance sans pr\u00e9ciser la technologie des cellules constitue une commande incompl\u00e8te. Voici ce que montrent les recherches.<\/p>","protected":false},"author":1,"featured_media":6741,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"","_seopress_titles_title":"DLI vs Transmittance: The Agrivoltaic Panel Spec Mistake","_seopress_titles_desc":"Transmittance % alone is an incomplete agrivoltaic spec. DLI, cell technology, and shading level determine crop outcomes. Research-backed guidance.","_seopress_robots_index":"","footnotes":""},"categories":[1127],"tags":[],"class_list":["post-6738","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-solar-101"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/couleenergy.com\/fr\/wp-json\/wp\/v2\/posts\/6738","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/couleenergy.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/couleenergy.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/couleenergy.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/couleenergy.com\/fr\/wp-json\/wp\/v2\/comments?post=6738"}],"version-history":[{"count":2,"href":"https:\/\/couleenergy.com\/fr\/wp-json\/wp\/v2\/posts\/6738\/revisions"}],"predecessor-version":[{"id":6743,"href":"https:\/\/couleenergy.com\/fr\/wp-json\/wp\/v2\/posts\/6738\/revisions\/6743"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/couleenergy.com\/fr\/wp-json\/wp\/v2\/media\/6741"}],"wp:attachment":[{"href":"https:\/\/couleenergy.com\/fr\/wp-json\/wp\/v2\/media?parent=6738"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/couleenergy.com\/fr\/wp-json\/wp\/v2\/categories?post=6738"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/couleenergy.com\/fr\/wp-json\/wp\/v2\/tags?post=6738"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}