The Exo-Terra Night Heat Lamp Reptile Bulb features blue glass to simulate natural moonlight without altering natural day length or photo period. This is a great way to view your reptiles natural nocturnal activities without causing interruption! Simulates natural moonlight for nocturnal viewing Promotes normal digestion, breeding behaviors and other healthy activities Maintains tropical night time temperatures This lamp features a Neodymium sleeve and emits a bluish light that will not disrupt your reptile or amphibians day/night cycle. Heat emitted is minimal, but still enough to replicate tropical night temperatures. The low wattage does not interfere with natural night drops in temperature.Tip: Combine with Exo Terra Daytime Heat Lamp or Repti Glo to create a 24-hour cycle. Formerly known as the Night Glo Moonlight Lamp.Note: This lamp does NOT provide UVB.