Quality replacement bulbs for power compact lights and metal halide.
For PC lights, choose white, white with actinc, or actinc bulbs.
Actinic is a a type of lighting that provides the proper spectra for photosynthesis. It is best used for aquariums with live plants or chlorophyll containing species such as reef coral. Actinic bulb gives off blue colored light often used in marine aquaria to make corals appear to glow with brilliant colors and to give the tank a "deep ocean" feel.