Based on a 03 actinic spectrum but widened to enhance visibility of fish at night, the moonlight lamp is a great addition to complement any of the other Interpet lamps. Used at night, it allows fishkeepers to see their livestock. It also provides a spectrum to allow corals to be seen fluorescing. If the moonlight lamp is timed to come on before and go off after other lighting, it reduces stress to fish. Blue Moonlight also has a percentage of output in the UVA range below 400nm which allows corals that can, to fluoresce.