Be very careful you need air out the back of these or you cut there lifespan down so don't use a clamp with the big silver thing unless you drill a lot of holes in it the evil666 of nano reefs told me this and he was the first guy making these lights
Right Chappy I put one in a clamp on and could not position it correctly and when I removed the bulb it was very hot, which I thought odd for LEDs - gee these were very expensive, I thought a fixture would be easier, sigh...
