It would be "cool" if you could use the water in the tank to cool the led's and the heat from the led's to heat the tank. If the led's were mounted to a piece of metal that dipped in the water...OK, I don't know anything about reef tanks; it just seemed like a green idea.Oh yes its a big bugga lol around 30mm square going to get 5 or 6 of them for a big reef tank
Trying to find some big heatsinks