The exo terra night heat lamp 50w simulates natural moonlight to allow nocturnal viewing without disturbing the animals day and night cycler the light emitted is bluish due to the use of blue glass the heat generated by the bulb is minimal but enough to provide tropical night time temperaturesr the lower wattage of these bulbs does not interfere with natural night drops in temperature moonlight lamp that simulates natural moonlight and is perfect for nocturnal viewingr the bulb provides t