{"product_id":"dli-photoperiod-display-sensor-1","title":"DLI \u0026 Photoperiod Display Sensor","description":"\u003cdiv class=\"\"\u003e\n\u003ch1\u003eDescription\u003c\/h1\u003e\n\u003ch3\u003eApogee’s new, rugged DLI meters make it easier than ever to make research-grade measurements of PPFD, daily light integral, and photoperiod at any location.\u003c\/h3\u003e\n\u003cp\u003eThe different meter models can take instantaneous readings of PAR or ePAR (Extended \u003cspan\u003ePAR\u003c\/span\u003e - \u003cspan\u003ebeyond the traditional 400–700 nm range)\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eand automatically record the daily light integral (total photons in mols) and hours of light (photoperiod in 0.1 hours) for up to 99 days. This data can be viewed on the screen by toggling through the screens or downloading via USB cable.\u003c\/p\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0344\/9087\/6044\/files\/dli-header.jpg?v=1647516545\" width=\"100%\"\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eCompared with the ePAR and PAR-FAR sensors, the DLI Meter is more affordable and easier to use because it is a standalone product that displays all its readings and history of the data on the digital display. Recommend for people who want an easy solution to view and understand light data.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003ch1\u003e\u003cspan\u003eModels\u003c\/span\u003e\u003c\/h1\u003e\n\u003ch3\u003e\u003cspan\u003eDLI-400\u003c\/span\u003e\u003c\/h3\u003e\n\u003cdiv class=\"d-flex flex-wrap flex-md-no-wrap w-100 w-xl-60\"\u003e\n\u003cdiv class=\"w-100 w-md-50  w-md-40 w-xl-40\"\u003e\n\u003cul\u003e\n\u003cli\u003eLowest-cost option is accurate for measuring\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003e370\u003c\/span\u003e-650 nm in sunlight and under some broadband light sources.\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eSpecially calibrated for sunlight\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eDLI-500\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFull-spectrum is accurate for measuring 389-692 nm under all light sources.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eDLI-600\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eePAR is accurate for measuring the new ePAR 383-757 nm range under all light sources.\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e\u003cem\u003eWe recommend this unit.\u003c\/em\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"w-100 w-md-50 w-xl-60  d-flex justify-start align-start\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0344\/9087\/6044\/files\/dli-wavelength.png?v=1647520923\" class=\"pa-3\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"d-flex align-center flex-wrap\"\u003e\n\u003cdiv class=\"w-100 w-lg-70\"\u003e\n\u003ch1 class=\"product-page-title\"\u003eData Collection and Display\u003c\/h1\u003e\n\u003cdiv class=\"product-page-content\"\u003e\n\u003cul\u003e\n\u003cli\u003eMeter displays real-time PPFD\/PAR or ePAR in µmol m\u003csup\u003e-2\u003c\/sup\u003e\u003cspan\u003e \u003c\/span\u003es\u003csup\u003e-1\u003c\/sup\u003e; daily light integral (DLI) in mol·m\u003csup\u003e-2\u003c\/sup\u003e·d\u003csup\u003e-1\u003c\/sup\u003e; and photoperiod in 0.1 hour increments.\u003c\/li\u003e\n\u003cli\u003eDLI and photoperiod measurements are recorded continually every three minutes with a darkness threshold of .1 µmols.\u003c\/li\u003e\n\u003cli\u003eDaily data is stored up to 99 days and displayed onscreen by toggling through the screens.\u003c\/li\u003e\n\u003cli\u003eDLI, photoperiod, and 30 minute PPFD averages can be downloaded as CSV files via the USB-C port under the battery cover using the included USB-A to USB-C cable.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"w-100 w-lg-30\"\u003e\n\u003ch2\u003e\u003cimg alt=\"240w regular ppfd\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0344\/9087\/6044\/files\/DLI_screen__60627.1643401099.jpg?v=1646400415\"\u003e\u003c\/h2\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cp class=\"product-page-content\"\u003e \u003c\/p\u003e\n\u003ch1 class=\"product-page-content\"\u003eWhat is DLI?\u003c\/h1\u003e\n\u003cdiv class=\"product-page-content\"\u003eDaily Light Integral (DLI) is the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003etotal number of photosynthetically active radiation\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(PAR)\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ephotons\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(traditionally those between 400-700 nm and now 400-750nm)\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eincident on an area over the course of a day.\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-page-content\"\u003eDLI is a function of both the intensity and duration of the photosynthetic light falling on the target over a day and is most commonly expressed as moles of light per square meter per day or mol m\u003csup\u003e-2\u003c\/sup\u003e d\u003csup\u003e-1\u003c\/sup\u003e.\u003c\/div\u003e\n\u003cdiv class=\"product-page-content\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"product-page-content\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"d-flex flex-row align-center justify-center float-right\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0344\/9087\/6044\/files\/dli-photo-2.jpg?v=1647516545\" class=\"w-50 w-md-30 pa-3\" style=\"top: 0; border-radius: 50%;\"\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0344\/9087\/6044\/files\/dli-photo-3.jpg?v=1647516545\" class=\"w-50 w-md-30 pa-3\" style=\"top: 0; border-radius: 50%;\"\u003e\n\u003c\/div\u003e\n\u003ch2 class=\"product-page-content\"\u003eBenefits of knowing DLI?\u003c\/h2\u003e\n\u003cdiv class=\"product-page-content\"\u003e\n\u003cdiv class=\"product-page-content\"\u003eSpecific plants and other photosynthetic organisms, like corals, require different daily light integral levels to achieve optimum growth. There are many resources available that list different\u003cspan\u003e \u003c\/span\u003e\u003ca title=\"DLI recommendations\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0344\/9087\/6044\/files\/Measuring_Daily_Light_Integral_in_a_Greenhouse.pdf?v=1646662090\" target=\"_blank\"\u003eDLI recommendations.\u003c\/a\u003e \u003c\/div\u003e\n\u003cdiv class=\"product-page-content\"\u003e \u003c\/div\u003e\n\u003cdiv class=\"product-page-content\"\u003eTo make an accurate measurement of the DLI during a day with changing light levels, a high-quality quantum sensor must be used and coupled with a data recorder to log and sum all the measurements from the day. A quantum sensor, also known as a PAR or PPFD (photosynthetic photon flux density) sensor, measures the intensity of photosynthetic light incident on a target.\u003c\/div\u003e\n\u003cdiv class=\"product-page-content\"\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-page-content\"\u003e\u003cstrong\u003eAlmost universally, photosynthetic light is defined as equal weighting of all photons between 400-700 nm (DLI-500). Newer research is showing that photons between 400-750 nm (DLI-600) are also photosynthetic and should be counted towards DLI.\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv class=\"product-page-content\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"product-page-content\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"product-page-content\"\u003e\n\u003ch1\u003eDLI for cannabis\u003c\/h1\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-page-content\"\u003e\n\u003cp\u003eDifferent strains have different DLI stress points, and while the range is wide, virtually all strains can handle somewhere between 40-50 DLI.\u003c\/p\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0344\/9087\/6044\/files\/dli-photo-1.jpg?v=1647516545\" class=\"w-100 w-md-30 float-right pa-5\" style=\"top: 0; border-radius: 50%;\"\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003eIf your light cannot metabolize the current light, you will experience light stress because if an absorbed photon does not get absorbed, it creates heat in the plant and that heat can cause stress. \u003cbr\u003e\u003cbr\u003eWhile a plant can only grow as fast as the weakest link, the primary driver of plant metabolism is light. Careful testing and logging will allow you to optimize your DLI targets. \u003cbr\u003e\u003cbr\u003eIf light-stress is seen below 45 DLI, the grower should investigate ways to improve their nutrient throughput, environmental conditions and so on - to be able match the metabolism demanded, or dial the DLI target back.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2 class=\"product-page-content\"\u003eThe Importance of DLI in Greenhouse Production\u003c\/h2\u003e\n\u003cp\u003eDLI in green house production is critical to be able to adjust your supplemental lighting.\u003c\/p\u003e\n\u003cp\u003eAs for the energy consumption with these higher levels of supplementation, in general the value of cannabis yield exceeds the cost of the electricity required to produce it by 20+ times. So, electrical consumption is just not an important consideration compared with the yield results. Only if the necessary power infrastructure is unavailable, or if the budget is not feasible should lower supplemental levels be chosen.  At current prices,\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ecannabis\u003cspan\u003e \u003c\/span\u003e\u003cem\u003ealways\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003ejustifies the electricity necessary to produce it up to the DLI limit.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"product-page-content\"\u003eTo determine DLI of an area illuminated by a light source with a constant output and known duration, an instantaneous PAR measurement can be made and used to calculate DLI\u003c\/div\u003e\n\u003cdiv class=\"product-page-content\"\u003e \u003c\/div\u003e\n\u003cdiv class=\"product-page-content\"\u003eCalculation of DLI from an instantaneous PAR measurement relies on the assumption that the light source is constant while it is on. If there is variability in the light source, such as a greenhouse, then calculation of DLI from an instantaneous PAR measurement will be incorrect.\u003c\/div\u003e\n\u003cdiv class=\"product-page-content\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"product-page-content\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"product-page-content\"\u003e\n\u003ch1\u003e\u003cspan\u003eApplication of use\u003cbr\u003e\u003c\/span\u003e\u003c\/h1\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003ePPFD\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDLI\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePhotoperiod\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eData Recording\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCanopy Light Absorption\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eGreenhouse Light Absorption of Windows \/ Outdoor Netting\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAdjust Supplemental Lighting\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003ch1\u003eFeatures\u003cbr\u003e\n\u003c\/h1\u003e\n\u003ch3\u003eAccurate, Stable Measurements\u003c\/h3\u003e\n\u003cp\u003eMeters are cosine-corrected to maintain accuracy when radiation comes from low angles (± 5 % at 75° zenith angle). Long-term non-stability determined from multiple sensors in accelerated aging test and field conditions is less than 2% per year.\u003c\/p\u003e\n\u003ch3\u003eRugged Design\u003c\/h3\u003e\n\u003cp\u003eHousing is built tough to withstand harsh environments and is dustproof and waterproof up to IP65. Unit consists of a cast acrylic diffuser (filter), optical filter, photodiode, signal processing circuitry, LCD display, and two AAA batteries (included). Battery lasts +- 6 months.\u003c\/p\u003e\n\u003ch3\u003eMounting\u003c\/h3\u003e\n\u003cp\u003eUnit can be placed directly on any flat, level surfaces or mounted by attaching to commonly available camera tripods, clamps or stakes using the standard camera-sized ¼-20 threaded port in the bottom of the unit. A small plastic soil stake is included for standing the unit in turf or other soft soils.\u003c\/p\u003e\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cp\u003eMonitoring PAR or ePAR intensities, daily light integral, and the photoperiod of grow-lighting is critical for plant health, growth rate, photosynthesis levels, plant morphology, and crop steering. Required levels vary greatly by species and should be measured and controlled for optimum specimen health.\u003c\/p\u003e\n\u003ch3\u003eCalibration\u003c\/h3\u003e\n\u003cp\u003eTo ensure accuracy, each DLI meter is carefully calibrated in controlled conditions and traceable to NIST reference standards.\u003c\/p\u003e\n\u003ch3\u003eWarranty\u003c\/h3\u003e\nAll Apogee products are backed by an industry-leading \u003cstrong\u003e4-year warranty\u003c\/strong\u003e.\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch1\u003eHow to use\u003c\/h1\u003e\n\u003cp\u003e1. Find out the DLI requirement of your crop.\u003c\/p\u003e\n\u003col\u003e\u003c\/ol\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eCannabis flowering \u003cspan\u003e20-65 DLI\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e2. Obtain lighting that provides you the maximum DLI of the crop you plan to grow.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCannabis max \u003c\/span\u003e45 DLI in flowering to optimize most strains\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSome strains can go up to 65DLI\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWhat ppfd am I aiming for?\u003cbr\u003e\u003c\/p\u003e\n\u003cp class=\"product-page-content\"\u003eCannabis Stage Recommended PPFD range (μmol s-1 m-2 )\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSeed Sprouting \/ Root Cloning: 100 to 400\u003c\/li\u003e\n\u003cli\u003eVegetative Growth: 250 to 600\u003c\/li\u003e\n\u003cli\u003eFlowering (Reproductive) Stage: 600(26 DLI) to 1000 (43 DLI) without co2\u003c\/li\u003e\n\u003cli\u003eFlowering (Reproductive) Stage: 1000(4\u003cspan\u003e3\u003c\/span\u003e DLI) to 1500 (65 DLI)+ with co2\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eWhat DLI am I aiming for?\u003c\/h2\u003e\nCannabis recommended flowering 20-65 DLI - will have a uniform increase in yield proportional to DLI right up to 45 DLI, with many strains going as high as 50 DLI or more. For vegetative stage the DLI should not be less than 25% of the flowering DLI to avoid potential \"light\" shock.\u003cspan\u003eWe’ve noticed that different cultivars respond differently to light intensities. Some may reach a light saturation point a lot faster than others.\u003c\/span\u003e\u003cspan\u003e\"At one of our farms, I had a Panama Red variety that would not produce anything if I moved my light level over about 900 PPFD(DLI 38.88 at 12 hours of light). No matter how much extra CO2 I gave it, no matter how much extra water and mineral nutrients I gave it, that plant peaked out when I gave it a treatment of 900 PPFD of light. What that told me is that the genetic limitation might have been reached right there, and therefore every plant has a genetic limitation.\"\u003c\/span\u003e \n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eGreen Houston is an \u003cspan\u003e \u003c\/span\u003e\u003c\/em\u003e\u003cem\u003eofficial\u003c\/em\u003e\u003cem\u003e \u003c\/em\u003e\u003cem\u003e distributor\u003c\/em\u003e\u003cem\u003e for all Apogee instruments in Africa, imported directly from Apogee USA.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003ePlease contact office@greenhouston.co.za for all Apogee sensors and variants.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cmeta charset=\"utf-8\"\u003ePlease note: Apogee products are imported from the USA and due to the fluctuating exchange rate, prices are not fixed and may be subject to change. Requesting a quote before placing an order is highly recommended.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"product-page-content\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp class=\"product-page-content\"\u003e \u003c\/p\u003e\n\u003ch1\u003eProduct Demo and informational Video\u003c\/h1\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003ciframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/WEd8ZjD9zFM\" style=\"height: 50vh;\" width=\"100%\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e","brand":"Apogee Instruments","offers":[{"title":"DLI-600","offer_id":42531602071795,"sku":"","price":13999.0,"currency_code":"ZAR","in_stock":true},{"title":"DLI-400","offer_id":42531602006259,"sku":"","price":8999.0,"currency_code":"ZAR","in_stock":false},{"title":"DLI-500","offer_id":42531602039027,"sku":"","price":13299.0,"currency_code":"ZAR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0344\/9087\/6044\/files\/DLI-400-front.png?v=1750753270","url":"https:\/\/greenwares.myshopify.com\/products\/dli-photoperiod-display-sensor-1","provider":"Green Houston","version":"1.0","type":"link"}