Key Features Simulates Moonlight UVA and Actinic for healthy and florescing corals Perfect for night viewing Promotes Coral Growth 36w watt - 48" (1200mm) Interpet Blue Moonlight 36W T8 aquarium bulb simulates moonlight lighting conditions for your fish and plant life. This bulb is UVA and Actinic meaning it is excellent for fluorescing corals and plant life. This bulb measures 48 inches (1200mm). For use in marine aquariums (Use with Tropical Daylight and Reef Daylight Lights) Wattage: 36 Fitting: T8 Length: 48 inches (1200mm) Use: Marine Aquariums in tandem with tropical daylight bulbs