Reptile Ceramic Infrared Heat Emitter 25 watt This Ceramic Infrared Heat Emitter 25 watt, is helpful if you need to maintain a minimum temperature level; controlled by one of our Digital Program Timers; 7-day, dual-outlet. We recommend a ceramic heat emitter for maintaining a minimum night time temperature, NOT the use of some colored heat bulb. Check the actual temperatures with our Digital IR Surface Thermometers. Although manufacturers of colored heat bulbs claim that the reptiles cannot see the color, we believe that they sense that it is not dark and dont sleep as well. Temperature outputs can vary depending on the type and brand of habitat, substrate and dcor accessories. FOR SAFETY, before introducing your animal into the heated habitat, please allow 3 to 6 hours of initial warm-up time and then check the surface temps; using a thermometer such as our Digital IR Surface Thermometer.