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Does anyone have any links to articles or good threads that discuss the basics of MH setups. For instance, pros and cons of single vs. double ended fixtures, two seperate ballasts vs. one dual ballast, importance of supplemental lighting, etc... So far all I know for sure is that I want two 250 lamps with an electronic ballast (or two).
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Well to help you out with your question about dual and separate ballasts...
They are basically the same thing. I dual ballast is a box that house two separate ballasts. It may or may not have a single plug powering both ballasts.
You are correct in wanting two metal halide bulbs over your 90 gallon. Typically you are looking at 1 bulb for every 2x2 foot area of tank floor space.
Now for some links...
Facts of Light – Part 5: Everything You Need to Know About Metal Halide Lamps and Ballasts by Sanjay Joshi - Reefkeeping.com Metal Halide Lighting Components by Jon Garner - Reefkeeping.com Testing 250-watt Single-ended Metal Halide Lamps and Ballasts by Joe Burger - Reefkeeping.com
There's a ton more articles and websites regarding metal halide lighting, but that will get you started
