[Mike de Leon]

What I just found out switching to 400 watt SE bulb is that it produces less heat than 250 DE. But the intensity is a lot more. Corals are happier. I have already noticed more growth and coloration in the two weeks i have had it. This is without any flourescent supplementation. Very simple set up. Just two 400 watt bulbs over a six foot long tank.
If you intend to keep SPS forget 250 watts. Go straight to 400 watts. You will not regret it. Double ended fixtures seem to cast more shadows due to design. SE reflectors are large and tend to have more coverage.
I had DE for a couple of years. They have hot spots and shadows.

Good luck!