Microclimate B1 reptile thermostat. These Microclimate thermostats regulate power output and dim the power source rather than turning it on and off. This method of temperature regulation allows you to use these thermostats with incandescent globes as the dimming prolongs the life of these globes. These thermostats can be use with all other heat sources also. They control up to 600 watts of any heat source. Fully wired ready to use.