I have been really interested in the use of LEDs to supplement compact fluorescent and fluorescent tube lighting. both are cheap to run and produce little to no heat. in the past I've tried using the LED lightbulbs with edison bases, they put off a cool white like fluorescent lights do. tried using a couple high powered cool white LED bulbs with edison bases in addition to a small row of 1 watt blue and red LEDs hooked up to a battery, thought the cool white might help more in the veg phase.
does anyone think using a combination of CFL and fluorescent tubes in both cool and warm white and with a supplement of UVA and UVB fluorescent tubes (something I've tried) would get much benefit from adding cool white LEDs plus a row of maybe a few hundred multi-watt ultra bright LEDs? would like to try and run the LEDs off of solar... but I'm getting ahead of myself.
I've seen some plant light LED schematics on instructables but haven't bothered yet till I hear more about how LEDs can be used as supplement lighting.
by the way, sorry if this site has already been mentioned, but if it hasn't check out
Growing Marijuana with LED, Growshow for some interesting results from cannabis grown with LEDs only.