![]() ![]() Table 1 shows how a 600W LED grow light performs at varying distances from the plant canopy. Table 1: Distance of LED Lighting from Plant Canopy (600W LED Grow Light) LED source shown here does not use a reflector to direct the light * Coverage will vary based on the grow light being used. It is also important because lights placed too close to the canopy can cause burning, bleaching, stunted growth, or discoloration. PPFD is an important metric because it helps growers accurately measure the light intensity for photosynthesis at the canopy level. PPFD is the measurement of the amount of light (photons) the sun “pours” onto the plants over time. As the sun pours light onto the plants, their leaves are collecting the energy. ![]() PPFD represents the light density a plant receives over time and is measured in micromoles per square meter per second (1).Ī way to visualize PPFD is to imagine the sun is “pouring” light onto the plant leaves. PPFD (Photosynthetic Photon Flux Density) measures the amount of light (PAR) a plant receives over time. ![]() PAR (Photosynthetically Active Radiation) describes the portion of the visible spectrum that plants “see” and use for photosynthesis (400nm-700nm). It also addresses how to determine the proper distance of LED lighting from the plant canopy to nourish plant growth, as well as the importance of PPFD (PAR), and other popular grow light terminology. This article outlines the different lighting needs for a variety of plants, (including cannabis) according to their growth stage. See all available Cannabis Grow Lights by BIOS It is important to also understand how optimal grow light distance impacts the different phases of plant growth. LEDs emit less heat than HID sources which means that the proximity of LED grow lights to the canopy varies from that of traditional grow lights. Today, more growers are moving away from traditional HID and fluorescent T5 grow lights and are installing LED lighting. ![]()
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