Welcome to the Aquarium Lighting Guide, where you can find everything you need to know about lighting your marine, reef, freshwater, or fish-only aquarium. The purpose of the Aquarium Lighting Guide is to provide information to help you make the best decision for lighting your aquarium. The Aquarium Lighitng Guide covers topics such as metal halides, compact fluorescents, linear fluorescents, wiring diagrams, metal halide ballast ANSI code lookup, and an aquarium lighting directory.