Blue light is also required in good quantity for happy plants!īlue light is so important that plants literally don’t know where to aim their leaves for light absorption without it. Many LED grow lights also are red-heavy.Īlthough plants can be grown with pure red light, too much of only red light will not help early vegetative growth. Interestingly enough, plants make the most amount of energy during photosynthesis from red light.ĭon’t be fooled by the color you see-even MH (metal halide) grow lights that don’t look very red provide a fair amount of red light to plants. Plants need red color light need to grow healthy. Red-heavy grow lights do promote heavy budding and flowering, but this doesn’t mean that you should only use red light for your plants.īalanced with blue light, red light can be used during the whole course of a plant’s life-from seed to harvest. In nature, red light comes out from the sun during late summer and fall, which can explain part of the reason buds form up fat then (the other part is light hours). Red light in nature helps to promote all-around growth and the flowering process. This provides plants will get a similar spectrum of light that they would expect from the sun.
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Most importantly, red light and blue light.Ī balanced full spectrum LED grow light will have not just one red and one blue color frequency but a whole range of light available to plants.
When designing full spectrum LED panels, manufacturers dial in on the color wavelengths that plants absorb the most of while also providing other colors for balanced light exposure. 200–400 µmol/m²/s: Low strength light, good for delicate seedlings and clones.400–600 µmol/m²/s: Medium strength light, for early veg and stretching.600–1000 µmol/m²/s: High strength light, the best range for developing growth and flowering.Testing the PAR output of a LED grow light may give you an idea of how far away to hang your lights from the plant canopy for optimum growth. We use PPFD to measure the PAR output of LED grow lights. PPFD shows the density of PAR light in a given area, such as the density of PAR light at 12″ away from the LED grow light. PPFD, measured per second and square meter (µmol/(m -2 m -1 simply written as µmol/m²/s) which we call micromoles or “uMoles” as slang. PPFD stands for Photosynthetic Photon Flux Density.Only light in the ranges of 400nm to 700nm is measured. PPF, short for Photosynthetic Photon Flux, is the number of light photons that make contact with your plants every second.This handy device measures per second how many photons of light hit the sensor. You can check the PAR output of a grow light using a PAR meter (also called a PPF meter). This is why we measure the performance of LED grow lights in relation to PAR output rather than Lumens. A plant uses blue light (400nm–500nm) and red light (620nm–700nm) wavelengths in the greatest concentrations. The PAR spectrum includes the light wavelengths of approximately 400nm to 720nm, illustrated below:īy looking at the PAR spectrum graph, we can see that plants use some colors more than others. We call this optimal range PAR, short for photosynthetically active radiation. LED grow lights are designed to provide the optimum light wavelengths most beneficial to plant growth. Sunlight gets absorbed by the plant’s pigment molecules for photosynthesis (plant growth). When cannabis grows outdoors, the sun provides the full spectrum of light that the plant needs to grow naturally. Just like how we can see only a certain range of light spectrum with our eyes, plants use a certain range of light spectrum to grow. Full Spectrum & Light Wavelength Explained Absorption of Light
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