LivingDread
Registered on
Sep-26-2007
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Message #43719 posted by LivingDread (Info) September 29, 2007 17:55:21 ET
i am thinking about led grow lights. i see a lot of mixed reviews, but they are really attractive to me because heat is going to be an issue. i am attaching an image file that compares chlorophyll light wavelength absorption, with the light produced by metal halides and that of a typical led grow light. you can see that the consumer led has lights in 460nm and 630nm wave lengths. these spikes are incredibly higher than those in the halide lamp, but they do not cover as wide a spectrum. i saw a youtube video comparison of two identical grow rooms, one with conventional lamps, and the other with led's. the led's seemed to do almost as well as the conventional methods. i want to build my own set of led breadboards with light in 400nm (uv?), 450nm, 630nm and 660nm. there will be twice as much red as there is blue (twice as many 660nm as 630nm, and split 2:3 400nm and 450nm on the blue side of the equation), however i intend to build an extra blue board for the veg stage, what do you think?
also, a science'y question, i know that sound waves can combine and dampen each other's quality, but does light do that too? i am guessing not because otherwise white sunlight would be neutral (in this case green, but we just said it was white, didn't we?);in fact white light carries all of the wavelengths at once. should i make a separate bread board for each wavelength i intend to use, or should i distribute colors evenly over the boards?
also about the 400nm, is that uv? commercial led grow lights boast "no uv," but looking at the graph, isn't that exactly what i want?
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