Flukers Black Nightlight Bulb is an excellent source of the direct radiant heat that cold blooded reptiles need for proper metabolism. These long life bulbs last up to 3500 hours and do not create visible light to support your reptiles daynight cycle. Emits no visible light to support daynight cycle Source of radiant heat infrared light Up to 3500 hour bulb life Radiant heat is critical for providing reptiles with a healthy habitat. If a reptile is not provided with appropriate environmental temperature range ETR it cannot regulate its core body temperature and may be more prone to chronic infections. Ideal ETR varies from species to species consult your pet professional for lighting recommendations for your pet. Flukers Black Nightlight bulbs emit low levels of supplemental UV radiation to provide the heat reptiles need during the night cycle. The sun produces three types of light ultraviolet visible and infrared. UV light helps in regulating behavior and stimulating Vitamin D production in reptiles. Visible light is the spectrum of light that allows humans and animals to see within our environment. Flukers 5.0 UVB and 10.0 UVB Sun Glow Coil Bulbs generate both UV and visible light and should be used in combination with Flukers incandescent light bulbs to mimic natural sunlight. Directions Gently fasten the Flukers incandescent bulb into a Fluker Clamp Lamp or Hood or any UL approved incandescent fixture. Do not plug light fixture into an electrical socket until bulb is fastened firmly to fixture. Place light fixture outside of reptiles enclosure. Important NEVER place the light fixture inside the enclosure. Reptiles can develop life threatening thermal burns from contact with an exposed light bulb. Note Multiple incandescent lights may be required to establish an appropriate ETR. A Flukers thermometer can be used to monitor temperature within the reptiles environment. Reptile behavior is directly tied to photoperiod light cycle so it is important to provide appropriate intervals of flight and darkness. Flukers recommends a 12 hour day12 hour night light cycle. A Flukers Daytime bulb should be used during the daytime cycle.