I've been researching LED lighting for the last year or more, and it's only been recently that efficiency as far as light out, has gotten good enough that I'm about ready to build some sort of agricultural LED unit. First I ran accross the 'perfect led light' thread and now this one.

After trolling around here the last few days I really have to thank you all for sharing the knowledge and turning me on to all this.. I'd like to share some info I ran accross pertaining to unlocking an optimised red/far-red day/AD cycle I hope it helps someone..

The plant physiology link has soem hardcore data on effects or red/far-red on a plants co2 intake and circadian rhthym - which i think might hold the key for an amature like myself in trying to get plants to adapt and thrive by the artificial rhthym of the artificial darkness

The other link is to a page on the USDA website, it has a bit of history on far-red and agriculturalists that goes back to the early 1900's (wow) but also has some good plugs of info they give away since the US has been trying to unlock the secrets artificial darkness since 1959

www.plantphysiol.org/cgi/reprint/67/5/965.pdf

ARS Research Timeline - Story on Phytochrome, Other Light Research