I was wondering if anyone could point me in the right direction. I am sure someone somewhere has compared all of the different lighting choices we have. I am trying to figure out what is the best lighting for me to choose. I plan on having all different types of corals in my tank, but I am not sure what is the best lighting. I have read that xyz corals need 3-5 watts per gallon, and abc needs 7-9 watts per gallon and so on. But doesn't the type of lighting also come into play? Is the light output of a 175 watt metal halide the same as 175 watts from a T-5 or power compact? Obviously I am very confused about lighting...someone help!