veggi,

I picked the Luxeon III because it has a higher luminous flux than the K2, and they both have the same wavelength (and the same supplier - Future Electronics).

Would you recomend going with the LEDEngin red at 661nm? I am still trying to wrap my head around converting between lm and mw of Luminous Flux.

Since I have your attention, would you still recomend the K2 for the blue spectrum? Or has everyone gone to LedEngin?

Thanks for your post veggi! Made me rethink some things.
budderlvr Reviewed by budderlvr 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