Forum for saltwater aquarium lighting topics. Perhaps one of the most expensive components in a reef tank set up, lighting is a topic that should researched thoroughly by the hobbyist. The type of lighting you use will determine which corals you can keep. There are several options for lighting such as T5-HO, VHO, Metal Halide, Power Compact and more recently LED. The new LED set ups are rather expensive but they can save you money in the long run.