{"id":4870,"date":"2023-10-17T13:42:44","date_gmt":"2023-10-17T13:42:44","guid":{"rendered":"https:\/\/heliospectra.com\/?p=4870"},"modified":"2025-04-08T11:51:15","modified_gmt":"2025-04-08T11:51:15","slug":"horticulture-lighting-metrics-understand-grow-lights","status":"publish","type":"post","link":"https:\/\/heliospectra.com\/nl_old\/blog\/2023\/10\/17\/horticulture-lighting-metrics-understand-grow-lights\/","title":{"rendered":"Understand Grow Lights With Horticulture Lighting Metrics"},"content":{"rendered":"\n<div class=\"row\"  id=\"row-2012444629\">\n\n\n\t<div id=\"col-699118592\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner text-center\"  >\n\t\t\t\n\t\t\t\n\n<div class=\"row align-center\"  id=\"row-1936477662\">\n\n\n\t<div id=\"col-1939552287\" class=\"col medium-2 small-6 large-2\"  >\n\t\t\t\t<div class=\"col-inner\" style=\"background-color:#6ebd8f;\" >\n\t\t\t\n\t\t\t\n\n\t<div id=\"text-4063228177\" class=\"text\">\n\t\t\n\n<p>Research<\/p>\n\t\t\n<style>\n#text-4063228177 {\n  text-align: center;\n  color: rgb(255,255,255);\n}\n#text-4063228177 > * {\n  color: rgb(255,255,255);\n}\n<\/style>\n\t<\/div>\n\t\n\n\t\t<\/div>\n\t\t\t\t\n<style>\n#col-1939552287 > .col-inner {\n  border-radius: 34px;\n}\n<\/style>\n\t<\/div>\n\n\t\n\n\t<div id=\"col-1936881876\" class=\"col medium-2 small-6 large-2\"  >\n\t\t\t\t<div class=\"col-inner\" style=\"background-color:#6ebd8f;\" >\n\t\t\t\n\t\t\t\n\n\t<div id=\"text-3265107256\" class=\"text\">\n\t\t\n\n<p>Articles<\/p>\n\t\t\n<style>\n#text-3265107256 {\n  text-align: center;\n  color: rgb(255,255,255);\n}\n#text-3265107256 > * {\n  color: rgb(255,255,255);\n}\n<\/style>\n\t<\/div>\n\t\n\n\t\t<\/div>\n\t\t\t\t\n<style>\n#col-1936881876 > .col-inner {\n  border-radius: 34px;\n}\n<\/style>\n\t<\/div>\n\n\t\n\n<\/div>\n\t<div id=\"gap-1558833921\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-1558833921 {\n  padding-top: 30px;\n}\n<\/style>\n\t<\/div>\n\t\n\n\t<div id=\"text-574511388\" class=\"text\">\n\t\t\n\n<p><span data-contrast=\"auto\">Choosing the best LED grow lights for your facility is essential to growing healthy plants and getting a maximum return from your investment.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/p>\n<p><span data-contrast=\"auto\">But p<\/span><span data-contrast=\"auto\">urchasers of horticultural lights often <\/span><span data-contrast=\"auto\">encounter<\/span><span data-contrast=\"auto\"> a major challenge<\/span><span data-contrast=\"auto\">,<\/span> <span data-contrast=\"auto\">comprehending<\/span><span data-contrast=\"auto\"> the <\/span><span data-contrast=\"auto\">numerous<\/span><span data-contrast=\"auto\"> terms and metrics used to measure and describe the light emitted by these systems. This makes researching horticultural lighting a complex task.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/p>\n<p><span data-contrast=\"auto\">When researching about light spectrum and plant lighting efficacy you have probably come across Lumens, PAR, PPF, PPFD, and PPE.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/p>\n\t\t\n<style>\n#text-574511388 {\n  text-align: left;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-3821299882\" class=\"text\">\n\t\t\n\n<h5><span class=\"TrackedChange SCXW119702089 BCX9\"><span class=\"TextRun SCXW119702089 BCX9\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW119702089 BCX9\">Below is a list and explanation of the most common terms used:<\/span><\/span><\/span><span class=\"EOP TrackedChange SCXW119702089 BCX9\" data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/h5>\n\t\t\n<style>\n#text-3821299882 {\n  text-align: left;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-1790775683\" class=\"text\">\n\t\t\n\n<h6><em><span class=\"TextRun SCXW113149863 BCX9\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW113149863 BCX9\">Lumens<\/span><\/span><\/em><\/h6>\n\t\t\n<style>\n#text-1790775683 {\n  text-align: left;\n  color: #0c7088;\n}\n#text-1790775683 > * {\n  color: #0c7088;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"gap-2014787409\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-2014787409 {\n  padding-top: 10px;\n}\n<\/style>\n\t<\/div>\n\t\n\n\t<div id=\"text-3767735995\" class=\"text\">\n\t\t\n\n<p><span class=\"TextRun SCXW98695027 BCX9\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun CommentStart SCXW98695027 BCX9\">Plants and humans do not perceive light in the same way. The human eye perceives green light as the brightest<\/span><\/span><span class=\"TrackChangeTextInsertion TrackedChange SCXW98695027 BCX9\"><span class=\"TextRun SCXW98695027 BCX9\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW98695027 BCX9\">,<\/span><\/span><\/span><span class=\"TextRun SCXW98695027 BCX9\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"> <span class=\"NormalTextRun SCXW98695027 BCX9\">wh<\/span><span class=\"NormalTextRun SCXW98695027 BCX9\">ereas<\/span><span class=\"NormalTextRun SCXW98695027 BCX9\"> plants <\/span><span class=\"NormalTextRun SCXW98695027 BCX9\">primarily use<\/span><span class=\"NormalTextRun SCXW98695027 BCX9\"> blue and red light. A <\/span><\/span><span class=\"TextRun SCXW98695027 BCX9\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW98695027 BCX9\">Lumen <\/span><\/span><span class=\"TextRun SCXW98695027 BCX9\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW98695027 BCX9\">is a unit of <\/span><\/span><span class=\"TextRun SCXW98695027 BCX9\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW98695027 BCX9\">luminous flux <\/span><\/span><span class=\"TextRun SCXW98695027 BCX9\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW98695027 BCX9\">that relates to the brightness of light visible to the human eye<\/span><span class=\"NormalTextRun SCXW98695027 BCX9\">. &nbsp;<\/span><span class=\"NormalTextRun SCXW98695027 BCX9\">Luminous flux is calculated by <\/span><span class=\"NormalTextRun ContextualSpellingAndGrammarErrorV2Themed SCXW98695027 BCX9\">weighting<\/span><span class=\"NormalTextRun SCXW98695027 BCX9\"> (multiplying) the spectral distribution of a quantity of visible light <\/span><span class=\"NormalTextRun SCXW98695027 BCX9\">by<\/span><span class=\"NormalTextRun SCXW98695027 BCX9\"> values <\/span><span class=\"NormalTextRun SCXW98695027 BCX9\">representing<\/span> <span class=\"NormalTextRun SCXW98695027 BCX9\">human eye sensitivity<\/span><span class=\"NormalTextRun SCXW98695027 BCX9\"> to <\/span><span class=\"NormalTextRun SCXW98695027 BCX9\">particular wavelengths<\/span><span class=\"NormalTextRun SCXW98695027 BCX9\">. For this reason, a light source <\/span><span class=\"NormalTextRun SCXW98695027 BCX9\">having<\/span><span class=\"NormalTextRun SCXW98695027 BCX9\"> a high lumen value may not always be suitable for growing plants. Lumens are related to <\/span><\/span><span class=\"TextRun SCXW98695027 BCX9\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW98695027 BCX9\">lux <\/span><\/span><span class=\"TextRun SCXW98695027 BCX9\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW98695027 BCX9\">in that one lux is one lumen per square meter.<\/span><\/span><span class=\"EOP SCXW98695027 BCX9\" data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/p>\n\t\t\n<style>\n#text-3767735995 {\n  text-align: left;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-4107135776\" class=\"text\">\n\t\t\n\n<h6><em><span class=\"TextRun SCXW128637418 BCX9\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW128637418 BCX9\" data-ccp-parastyle=\"heading 4\">PAR&nbsp;<\/span><\/span><\/em><span class=\"EOP SCXW128637418 BCX9\" data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;201341983&quot;:0,&quot;335559738&quot;:40,&quot;335559739&quot;:0,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/h6>\n\t\t\n<style>\n#text-4107135776 {\n  text-align: left;\n  color: #0c7088;\n}\n#text-4107135776 > * {\n  color: #0c7088;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-1926180127\" class=\"text\">\n\t\t\n\n<p><span class=\"NormalTextRun SCXW135711910 BCX9\">(<\/span><span class=\"NormalTextRun SCXW135711910 BCX9\">Photosynthetically Active Radiation) is a region of the light spectrum (400 to 700 nm) that plants <\/span><span class=\"NormalTextRun SCXW135711910 BCX9\">utilize<\/span><span class=\"NormalTextRun SCXW135711910 BCX9\"> for the process of photosynthesis. PAR is not a measurement or metric but defines the range of light needed to support photosynthesis.<\/span><\/p>\n\t\t\n<style>\n#text-1926180127 {\n  text-align: left;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_135186110\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"922\" height=\"517\" src=\"https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2023\/10\/Skarmbild-2023-10-17-152831.png\" class=\"attachment-large size-large\" alt=\"\" srcset=\"https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2023\/10\/Skarmbild-2023-10-17-152831.png 922w, https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2023\/10\/Skarmbild-2023-10-17-152831-300x168.png 300w, https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2023\/10\/Skarmbild-2023-10-17-152831-768x431.png 768w, https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2023\/10\/Skarmbild-2023-10-17-152831-800x449.png 800w\" sizes=\"auto, (max-width: 922px) 100vw, 922px\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_135186110 {\n  width: 50%;\n}\n<\/style>\n\t<\/div>\n\t\n\n<p><em><span class=\"TextRun SCXW98615682 BCX9\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW98615682 BCX9\">Plant and human response to light<\/span><\/span><span class=\"TextRun SCXW98615682 BCX9\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW98615682 BCX9\">&nbsp;<\/span><\/span><span class=\"EOP SCXW98615682 BCX9\" data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/em><\/p>\n\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n\n<\/div>\n\t<div id=\"text-1015435856\" class=\"text\">\n\t\t\n\n<h6><em><span class=\"TextRun SCXW122882640 BCX9\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW122882640 BCX9\" data-ccp-parastyle=\"heading 4\">PPF<\/span><\/span><\/em><span class=\"EOP SCXW122882640 BCX9\" data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;201341983&quot;:0,&quot;335559738&quot;:40,&quot;335559739&quot;:0,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/h6>\n\t\t\n<style>\n#text-1015435856 {\n  color: #0c7088;\n}\n#text-1015435856 > * {\n  color: #0c7088;\n}\n<\/style>\n\t<\/div>\n\t\n<p><span data-contrast=\"auto\">(Photosynthetic Photon Flux) is a measure of the total amount of light within PAR that a light source emits each second. The unit used to express PPF is micromoles of photons per second (\u00b5mol\/s).<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/p>\n<p><span data-contrast=\"auto\">PPF is an important metric for calculating how efficient a lamp is at converting electrical energy into photons of PAR. Nonetheless, it is of essence to note that PPF does not tell you how much of the measured light actually arrives at the plant canopy. PPF measurements used to describe light sources should be done in specialized light laboratories using appropriate equipment such as light sensors connected to integrating spheres or goniometers. One recommended way is to use a light company that uses third-party testing.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/p>\n\t<div id=\"text-2094803649\" class=\"text\">\n\t\t\n\n<h6><em><span class=\"TextRun SCXW260898500 BCX9\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW260898500 BCX9\" data-ccp-parastyle=\"heading 4\">PPFD&nbsp;<\/span><\/span><span class=\"EOP SCXW260898500 BCX9\" data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;201341983&quot;:0,&quot;335559738&quot;:40,&quot;335559739&quot;:0,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/em><\/h6>\n\t\t\n<style>\n#text-2094803649 {\n  color: #0c7088;\n}\n#text-2094803649 > * {\n  color: #0c7088;\n}\n<\/style>\n\t<\/div>\n\t\n<p><span data-contrast=\"auto\">(Photosynthetic Photon Flux Density) measures the amount of light within PAR that actually falls on a given surface (the plant canopy area) each second. The unit used to express PPFD is micromoles of photons per square meter per second (\u00b5mol\/m<\/span><span data-contrast=\"auto\">2<\/span><span data-contrast=\"auto\">\/s).&nbsp; This measurement is done using a specialized instrument called PAR Light Meter or a properly calibrated spectrometer, which captures, and measures photons emitted by a light source.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/p>\n<p><span data-contrast=\"auto\">It is important for growers using LED grow lights to use the right measurement instruments as there are some that are not truly compatible with LEDs and could give a false PAR range. This is because some sensors are calibrated to measure luminous power or do not capture the full red in LED light.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/p>\n\t<div id=\"text-3687818639\" class=\"text\">\n\t\t\n\n<h6><em><span class=\"TextRun SCXW107034524 BCX9\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW107034524 BCX9\" data-ccp-parastyle=\"heading 4\">PPE&nbsp;<\/span><\/span><span class=\"EOP SCXW107034524 BCX9\" data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;201341983&quot;:0,&quot;335559738&quot;:40,&quot;335559739&quot;:0,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/em><\/h6>\n\t\t\n<style>\n#text-3687818639 {\n  color: #0c7088;\n}\n#text-3687818639 > * {\n  color: #0c7088;\n}\n<\/style>\n\t<\/div>\n\t\n<p><span data-contrast=\"auto\">(Photosynthetic Photon Efficacy) is the PAR photon output of a light source (measured in micromoles per second or \u00b5mol\/s) divided by the input power (Watt) to produce that light.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/p>\n<p><span data-contrast=\"auto\">PPE does not include the photons outside the PAR range. Wavelengths outside of the PAR range like far-red (FR) have proven to have a positive effect on growth and steer morphological responses of plants. The efficacy of light containing FR is lower than the efficacy of light sources emitting only blue and red light when measured as PAR photons per wall-plug energy consumption, even if they may give better results in plant biomass production and healthy growth.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span class=\"NormalTextRun SCXW212193737 BCX9\">If you want to learn more about the benefits and results of Far-Red, check out our free eBook <\/span><span class=\"NormalTextRun SCXW212193737 BCX9\">here:<a href=\"https:\/\/heliospectra.com\/growers-centre\/understanding-the-impact-of-far-red\/\" target=\"_blank\" rel=\"noopener\"> Understanding the impact of Far-Red<\/a><\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span data-contrast=\"auto\">Measuring and interpreting the total output of a lamp is a tricky thing. It is important to understand that light follows some simple geometrical rules. The PPFD decreases with the distance from a lamp while the footprint increases, so it is important to consider the size of the illuminated area (light footprint) and how uniform the light distribution is over this area. You should always request a light plan for your grow facility before purchasing lights.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/p>\n<p><span data-contrast=\"auto\">Many LED lights are not equipped with optics designed to distribute light uniformly. Measuring the output of lights at a single point can produce false information about its actual output. Therefore, it is advisable to measure light intensity at many points of an illuminated area.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/p>\n<p><span data-contrast=\"auto\">Since you are evaluating grow lights and light spectrum on plants, you want to make sure that the lighting manufacturers you are working with are knowledgeable on <\/span><span data-contrast=\"none\">horticultural grow lighting<\/span><span data-contrast=\"auto\"> and can provide you adequate information about light output, efficacy, spectral quality, and uniformity in units that are relevant for plants. You can find Heliospectra\u2019s light characteristics and metrics listed on our product specification sheets.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/p>\n<p><span data-contrast=\"auto\">The metrics we have discussed above focus on photons output but not light quality and efficiency of plant production. It is important that you also consider the light requirements or light needs of your specific crop. You want your lamps to deliver photons that are efficiently absorbed by your plants and enable them to grow well and achieve your desired quality.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:257}\">&nbsp;<br><\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span data-contrast=\"auto\">Contact <\/span><span data-contrast=\"auto\">us<\/span> <span data-contrast=\"auto\">by <\/span><span data-contrast=\"auto\">filling<\/span> <span data-contrast=\"auto\">out<\/span><span data-contrast=\"auto\"> the form below<\/span>&nbsp;<span data-contrast=\"auto\">and <\/span><span data-contrast=\"auto\">let<\/span> <span data-contrast=\"auto\">us<\/span> <span data-contrast=\"auto\">help<\/span> <span data-contrast=\"auto\">you<\/span><span data-contrast=\"auto\"> choose the best LED grow lights for your facility!<\/span><span data-contrast=\"auto\">&nbsp;<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:257}\">&nbsp;<\/span><\/p>\n\t<div id=\"gap-2092209318\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-2092209318 {\n  padding-top: 50px;\n}\n<\/style>\n\t<\/div>\n\t\n\n<div class=\"row\"  id=\"row-675628529\">\n\n\n\t<div id=\"col-1792189395\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\n\t<div id=\"gap-380927896\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-380927896 {\n  padding-top: 30px;\n}\n<\/style>\n\t<\/div>\n\t\n\n\t<div id=\"text-165753048\" class=\"text\">\n\t\t\n\n<h2>Related content<\/h2>\n\t\t\n<style>\n#text-165753048 {\n  text-align: center;\n}\n<\/style>\n\t<\/div>\n\t\n<div class=\"row\"  id=\"row-637644780\">\n\n\n\t<div id=\"col-1434213626\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\n\t<div id=\"gap-1150363014\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-1150363014 {\n  padding-top: 30px;\n}\n<\/style>\n\t<\/div>\n\t\n\n\n  \n    <div class=\"row large-columns-3 medium-columns-1 small-columns-1\" >\n  <div class=\"col post-item\" >\n\t\t\t<div class=\"col-inner\">\n\t\t\t\t<div class=\"box box-normal box-text-bottom box-blog-post has-hover\">\n            \t\t\t\t\t<div class=\"box-image\" >\n  \t\t\t\t\t\t<div class=\"image-cover\" style=\"padding-top:80%;\">\n\t\t\t\t\t\t\t<a href=\"https:\/\/heliospectra.com\/nl_old\/blog\/2023\/05\/23\/optimizing-the-healing-step-of-tomato-grafting-with-led-grow-lights\/\" class=\"plain\" aria-label=\"Optimizing the Healing Step of Tomato Grafting with LED Grow Lights\">\n\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"2338\" src=\"https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2023\/05\/5ef8b3d80f5e2973833554f4_Big20Bunch-p-2600-scaled.jpeg\" class=\"attachment-original size-original wp-post-image\" alt=\"\" srcset=\"https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2023\/05\/5ef8b3d80f5e2973833554f4_Big20Bunch-p-2600-scaled.jpeg 2560w, https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2023\/05\/5ef8b3d80f5e2973833554f4_Big20Bunch-p-2600-300x274.jpeg 300w, https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2023\/05\/5ef8b3d80f5e2973833554f4_Big20Bunch-p-2600-1024x935.jpeg 1024w, https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2023\/05\/5ef8b3d80f5e2973833554f4_Big20Bunch-p-2600-768x702.jpeg 768w, https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2023\/05\/5ef8b3d80f5e2973833554f4_Big20Bunch-p-2600-1536x1403.jpeg 1536w, https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2023\/05\/5ef8b3d80f5e2973833554f4_Big20Bunch-p-2600-2048x1871.jpeg 2048w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/>\t\t\t\t\t\t\t<\/a>\n  \t\t\t\t\t\t\t  \t\t\t\t\t\t\t  \t\t\t\t\t\t<\/div>\n  \t\t\t\t\t\t  \t\t\t\t\t<\/div>\n          \t\t\t\t\t<div class=\"box-text text-center is-large\" >\n\t\t\t\t\t<div class=\"box-text-inner blog-post-inner\">\n\n\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t<h5 class=\"post-title is-large \">\n\t\t\t\t\t\t<a href=\"https:\/\/heliospectra.com\/nl_old\/blog\/2023\/05\/23\/optimizing-the-healing-step-of-tomato-grafting-with-led-grow-lights\/\" class=\"plain\">Optimizing the Healing Step of Tomato Grafting with LED Grow Lights<\/a>\n\t\t\t\t\t<\/h5>\n\t\t\t\t\t\t\t\t\t\t<div class=\"is-divider\"><\/div>\n\t\t\t\t\t\t\t\t\t\t<p class=\"from_the_blog_excerpt \">\n\t\t\t\t\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t                    \n\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div><div class=\"col post-item\" >\n\t\t\t<div class=\"col-inner\">\n\t\t\t\t<div class=\"box box-normal box-text-bottom box-blog-post has-hover\">\n            \t\t\t\t\t<div class=\"box-image\" >\n  \t\t\t\t\t\t<div class=\"image-cover\" style=\"padding-top:80%;\">\n\t\t\t\t\t\t\t<a href=\"https:\/\/heliospectra.com\/nl_old\/blog\/2023\/06\/30\/yield-quality-or-both\/\" class=\"plain\" aria-label=\"Yield, Quality or Both?\">\n\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1624\" src=\"https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2023\/06\/AdobeStock_58521499-scaled.jpeg\" class=\"attachment-original size-original wp-post-image\" alt=\"\" srcset=\"https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2023\/06\/AdobeStock_58521499-scaled.jpeg 2560w, https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2023\/06\/AdobeStock_58521499-300x190.jpeg 300w, https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2023\/06\/AdobeStock_58521499-1024x650.jpeg 1024w, https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2023\/06\/AdobeStock_58521499-768x487.jpeg 768w, https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2023\/06\/AdobeStock_58521499-1536x975.jpeg 1536w, https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2023\/06\/AdobeStock_58521499-2048x1299.jpeg 2048w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/>\t\t\t\t\t\t\t<\/a>\n  \t\t\t\t\t\t\t  \t\t\t\t\t\t\t  \t\t\t\t\t\t<\/div>\n  \t\t\t\t\t\t  \t\t\t\t\t<\/div>\n          \t\t\t\t\t<div class=\"box-text text-center is-large\" >\n\t\t\t\t\t<div class=\"box-text-inner blog-post-inner\">\n\n\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t<h5 class=\"post-title is-large \">\n\t\t\t\t\t\t<a href=\"https:\/\/heliospectra.com\/nl_old\/blog\/2023\/06\/30\/yield-quality-or-both\/\" class=\"plain\">Yield, Quality or Both?<\/a>\n\t\t\t\t\t<\/h5>\n\t\t\t\t\t\t\t\t\t\t<div class=\"is-divider\"><\/div>\n\t\t\t\t\t\t\t\t\t\t<p class=\"from_the_blog_excerpt \">\n\t\t\t\t\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t                    \n\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div><div class=\"col post-item\" >\n\t\t\t<div class=\"col-inner\">\n\t\t\t\t<div class=\"box box-normal box-text-bottom box-blog-post has-hover\">\n            \t\t\t\t\t<div class=\"box-image\" >\n  \t\t\t\t\t\t<div class=\"image-cover\" style=\"padding-top:80%;\">\n\t\t\t\t\t\t\t<a href=\"https:\/\/heliospectra.com\/nl_old\/blog\/2024\/01\/02\/optimizing-your-light-environment-with-grow-zones\/\" class=\"plain\" aria-label=\"Optimizing your light environment with Grow Zones\">\n\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"2173\" height=\"1383\" src=\"https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2024\/01\/helioCORE_02.PNG-1.jpg\" class=\"attachment-original size-original wp-post-image\" alt=\"\" srcset=\"https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2024\/01\/helioCORE_02.PNG-1.jpg 2173w, https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2024\/01\/helioCORE_02.PNG-1-300x191.jpg 300w, https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2024\/01\/helioCORE_02.PNG-1-1024x652.jpg 1024w, https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2024\/01\/helioCORE_02.PNG-1-768x489.jpg 768w, https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2024\/01\/helioCORE_02.PNG-1-1536x978.jpg 1536w, https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2024\/01\/helioCORE_02.PNG-1-2048x1303.jpg 2048w, https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2024\/01\/helioCORE_02.PNG-1-800x509.jpg 800w\" sizes=\"auto, (max-width: 2173px) 100vw, 2173px\" \/>\t\t\t\t\t\t\t<\/a>\n  \t\t\t\t\t\t\t  \t\t\t\t\t\t\t  \t\t\t\t\t\t<\/div>\n  \t\t\t\t\t\t  \t\t\t\t\t<\/div>\n          \t\t\t\t\t<div class=\"box-text text-center is-large\" >\n\t\t\t\t\t<div class=\"box-text-inner blog-post-inner\">\n\n\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t<h5 class=\"post-title is-large \">\n\t\t\t\t\t\t<a href=\"https:\/\/heliospectra.com\/nl_old\/blog\/2024\/01\/02\/optimizing-your-light-environment-with-grow-zones\/\" class=\"plain\">Optimizing your light environment with Grow Zones<\/a>\n\t\t\t\t\t<\/h5>\n\t\t\t\t\t\t\t\t\t\t<div class=\"is-divider\"><\/div>\n\t\t\t\t\t\t\t\t\t\t<p class=\"from_the_blog_excerpt \">\n\t\t\t\t\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t                    \n\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div><\/div>\n\n\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n\n<\/div>\n\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n\n<\/div>\n<h3 style=\"text-align: center\">Get in touch with us!<\/h3>\n<p style=\"text-align: center\">From custom light planning, to tailored quotes, and everything in between, <br>our team of horticulture experts are always ready to assist.<\/p>\n\t<div id=\"gap-475377507\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-475377507 {\n  padding-top: 30px;\n}\n<\/style>\n\t<\/div>\n\t\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"596\" height=\"579\" src=\"https:\/\/heliospectra.com\/wp-content\/uploads\/sites\/2\/2023\/11\/Heliospectra_circular-plant_Web_72_Rityta-1-7.png\" alt=\"\" class=\"wp-image-5224\" style=\"width:610px;height:auto\" srcset=\"https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2023\/11\/Heliospectra_circular-plant_Web_72_Rityta-1-7.png 596w, https:\/\/heliospectra.com\/nl_old\/wp-content\/uploads\/sites\/2\/2023\/11\/Heliospectra_circular-plant_Web_72_Rityta-1-7-300x291.png 300w\" sizes=\"auto, (max-width: 596px) 100vw, 596px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-stretch is-layout-flow wp-block-column-is-layout-flow\">\n<div class=\"wp-block-leadin-hubspot-form-block\">\n\t\t\t\t\t\t<script>\n\t\t\t\t\t\t\twindow.hsFormsOnReady = window.hsFormsOnReady || [];\n\t\t\t\t\t\t\twindow.hsFormsOnReady.push(()=>{\n\t\t\t\t\t\t\t\thbspt.forms.create({\n\t\t\t\t\t\t\t\t\tportalId: 6999622,\n\t\t\t\t\t\t\t\t\tformId: \"aca44fbf-8585-4928-b858-6ce2d8b78f1a\",\n\t\t\t\t\t\t\t\t\ttarget: \"#hbspt-form-1776175999000-9679641945\",\n\t\t\t\t\t\t\t\t\tregion: \"na1\",\n\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t})});\n\t\t\t\t\t\t<\/script>\n\t\t\t\t\t\t<div class=\"hbspt-form\" id=\"hbspt-form-1776175999000-9679641945\"><\/div><\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":4,"featured_media":4873,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"content-type":"","footnotes":""},"categories":[100,96],"tags":[128,120],"class_list":["post-4870","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles","category-growers-centre","tag-alle","tag-licht-spectrum"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Understand Grow Lights With Horticulture Lighting Metrics<\/title>\n<meta name=\"description\" content=\"Horticulture Lighting Metrics: Understand Grow Lights. 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