Exo Terra® Heat Lamps are available in daytime and nighttime versions, depending on the application needed for your specific animals. While the daytime heat bulbs emit visible light in combination with the correct infrared-A heat radiation to simulate sunlight, the nighttime bulbs emit the correct infrared-A heat radiation without visible light to simulate moonlight and thus not disturb the animals day and night cycle. The Exo Terra® Heat Lamps will allow your reptiles to thermoregulate their body temperature to achieve the optimal temperature for enhanced activity and healthy digestion of their food items. All the Exo Terra® Heat Lamps are manufactured in colored glass to increase the transfer of heat waves which makes them highly energy efficient.