Sounds like you're planning a DIY upgrade? I have 3 x 250 watt DE bulbs plus VHO over my 75 gallon. I really like the color combo I have now (2 10000K AB and 1 20000K XDE), but I'm going to suggest you consider just using 400 watt SE bulb(s) instead. I like the DE bulbs with the IceCap/ LN ballasts, but because of UV issues (the DE bulbsput out a lot more UV than the SE bulbs, including UVC) you must use a tempered glass or acrylic "shield"- it's probably more to protect you than the corals and fish...
It can be done, but it's just much easier to DIY with SE bulbs. Also, changing SE bulbs is a lot easier than 250 watt DE bulbs- just unscrewing them versus pulling out the ceramic ends- I have broken a couple bulbs during changing (luckily when it was time to throw them out).
I'm not saying don't do it, but just to weigh heavily your skills and amount of interest in the project. You can always post questions here!!! If you want to see how I did mine, I can draw it up or try and get a hold of a digital camera. There are others who have done it, too- Ltspd, for example. He and Ninong answered many of my questions while doing mine. Just do a search on DIY HQI or DE bulbs and you'll find a slew of info!
Decisions, decisions!!!
James



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