Cheap is a ways away. My early projections would price each module around $75, so for an equivalent to the Procyon would be about $400 after you get a power supply and everything.

I have a hard time believing that heat will be a really big issue. I have a 650 watt power supply in my computer that is 85% efficient and it puts off very little heat. According to the datasheet on the K2s, they can be mounted on FR4 (regular PCB material, without metal core). The trick is using their pad design, coupled with a heat sink on the reverse side.

I am going to try digging around for some temperature info from other posters, perhaps someone could post their normalized heat sink temperature or the temperature of the metal core on their Luxeon Star.
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