Moon Controller System - For Moontube Aquarium Moonlights Automatic moon cycle controller (simulates the 29.5 day lunar cycle). Extreme 120 light spread ensures perfect coverage (compare with our competitors) for aquariums of all shapes. Epoxy sealed from water and humidity ensuring longer life from your moonlight. Compact size and unlimited mounting angles make our moonlights the easiest to mount and adjust. Beautiful 468nm blue light simulates natural moon light in your aquarium.