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It's very hard to generalize. Montipora digita (lps) is easier than cataphylia jardenei(elegance coral)(lps) which is easier than Dendronephtia(carnation)soft or leather. You really need to study the specimens you like before acquiring them. If you know where they live in nature,deepp reef ,crest,lagoons etc, you can aprroximate natual conditions to some degree.there are also compatability issues related to alleopathy(chemical releases by some corals which are harmful to others and nutrient requirements
among other things.
Watts per gallon is an almost useless guideline. It depends on depth ,how far away from the water your lights are, intensity, kelvin rating,spectrum and ultimately wether or not there is enough photosynthetically available radiation (PAR). PAR is light at the animal who will use it in the spectrum the zooxanthelae can use.
You should be able to do most things with the lighting you describe if you use a 10k bulb. A 250 halide might be better.
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Tom
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