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Luxeons get really toasty without proper heat sinking. This breakout board is a special aluminum PCB with isolated traces on the top layer. Designed to dissipate heat from the bottom of the Luxeon to the aluminum backing of the breakout board. For single and multiple LED arrangements. Works great for I and III watt Luxeon LEDs. You will need to attach this board to a larger sink for the V watt Luxeons.
Shown with a Luxeon III Royal Blue LED. We had to put a coffee cup over the LED while testing, it hurt our eyes so badly.