Bud,
I think the limiting design factor for LED Arrays should be watts per square foot of grow. The whole point of spending all this time and money is to use less electrical power to get an equal to a higher power HID.

I have limited my designs to a max of 35 watts per square foot. I would say most HID users are at 50 to 60 watts per square foot. I feel getting even a 30% power reduction would be highly significant and well worth the extra $$$.
redline Reviewed by redline on . budderlvr Modular LED Project I am working on a new modular LED grow light. This thread will be a diary of my experience as I work through some of the many design problems. Currently I am at the circuit design phase. Although I do not want to reveal too much of my design at this point I will provide some information that has guided my decisions. The LEDs I will be using are from Lumiled. I am using the Luxeon K2s for the blue spectrum, and Luxeon IIIs for the red spectrum. The ratio of RED to BLUE (I will call Rating: 5