We need to maintain approximately the same light energy power output on each wavelength.
Total light energy power should be around 350 Watts per meter sq (500 PAR (photosynthetic active radiation) watts for eqatorial sun).
Also you may have a look at my link in signature. There you may find spectras for chlorophyll a and b and carotenoids.
Dont guide too much by absortion spectra of photosynthetic pigments. One thing is their absortion in lab and other very different how they perform on live plants.

Photosynthetic response dont follow at all the pattern of chlorophills absortion. Many LED experiments have failed to be guided by chlorophills absortion instead by photosynthetic response, that are very differnt.

On the other hand, controling accuratelly the energy emission of such narrow wavebands is very complex. You are going to need a science rocket equipment to do that.

If you want to check reactions to very narrow wavebands, then probably laser diodes are a better choice than LEDs.

350W/m2 of irradiance is pretty high. Its about 1500uE/m2. Think that max irradiances at noon at 40ºN rarely goes over 1800uE/m2. And the daily average is way lower. You are going to need to use CO2 supplementation in order to use those average irradiances sucessfully.
knna Reviewed by knna on . Building LED lights from facts, no theories I was going to post this at the Perfect LED Grow Light thread, but as some of what im going to post was posted 2 years ago on the stickied thread about LEDs and people still continue developing lights from wrong ideas, i think a thread about this topic is largelly needed. The main problem is related to efficacy of spectrums. When the firsts LED experiments at Overgrow, we work on the hypothesis that blue and red light are more effective. It was an appealing hypothesis that promises large Rating: 5