Many Reptiles Require A Heated Environment But Normal Incandescents That Are Used As A Heat Source Emit White Light. This Can Interfere With The Reptiles Biorhythmic Cycle And Cause Sickness And Disease. An Alternative To Using A Light Emitting Heat Source Is To Use The Oz White Ceramic Heater. This Emits Heat Without The Light. We Recommend The Use Of A Thermostat With This Heat Source.