Here's a link to a good article on lighting for those who are thinking about upgrading their lighting or setting up the first reef tank. It explains the different types of lights that are available and pros/cons of each. Some of the info may be a little outdated such as changing VHO
bulbs every 4 months...there are ballasts that will run them for a year now. The basic info is very good though and, I think, worth a read.
I'll add it to the links list also.