Deep Heat Projector uses cutting edge technology to produce the most natural & effective wavelengths of Infra-Red. Infra-red-A & Infra-red-B provide heat deep within the muscle tissues, warming the animal throughout, just as the sun would in the wild. Internal reflector means far less heat is wasted. Also heats up quickly, reaching target basking temperature in a fraction of usual time. Produces virtually no visible light & can be used throughout the day & night. The Deep Heat Projector should be used with a dimming thermostat which will provide accurate control of thermogradient.