0verfl0w,
The heat is not too bad, I actually did not account for the height of the mogul mounts (4") when building the canopy and they ended up being about 5" from the water. Even still, the heat does not seem to be too much of a problem. I am planning on compensating in the summer with a fan in my sump. No chiller plans yet but we'll see!
They are REALLY bright though! I don't need lights in my living room anymore! LOL
E