I've been looking at lighting options for my 65 and have setteled on AI Sol LED fixtures.
http://www.aquaillumination.com/sol/Yes it's $600 with the controller.. OUCH!!!
http://www.aquacave.com/SearchResult.aspx?CategoryID=851It uses 3W cree LED's
It will outperform a 250W MH.
It only uses 75W
Little heat... testing by folks on the reef forums show about 1 deg increase vs lights off..
No chiller needed..
dimming 0-100%
the contoller has dusk/dawn and moon cycle built in..
Modular.. Get a bigger tank.. add on modules..
Just something to think about..
No bulbs to replace.. the LED don't shift over time and last for 5-10 years.