TrueLumen LED Lunar Lights cast the lustre of moonlight into your aquarium, illuminating the nocturnal environment and promoting natural spawning behaviors. 453nm Actinic Blue light casts deep nighttime glow over your tank. Energy efficient 2 inch lighting system consumes less than 1 watt of power to operate the 3 bright LEDs. Add one to your existing light fixture, hood or canopy or link multiple Lunar Lights for a complete 24-hour light cycle. Lunar lights include 3M adhesive and mounting hardware for easy attachment. Easy to install. Requires 12V transformer (sold separately).