Not only is it going to keep you bulbs cooler, but you tank water too...

I am running the IceCap 430 (thanks Vinh) and I'm driving 2 T12 110w Actinic White bulbs and a seperate 110w pc ballast for my actinic blues...

In the morning, my temp is a steady 78', by the end of the day (without air flow) my 55g tank temp is going up to 84'!!!

I have since added a small desk fan, plugged into my actinic timer and my water temp is never getting over 80' now...