Hello everyone, I made a DIY incubator with a water heater thermostat. When it gets close to the temp it's set at, the light flickers. Is this normal (safe)? The incubator is a styrofoam cooler, with a fan and a 15 watt bulb, should I get a bigger bulb? The thermostat is bout an inch from the light bulb. Is this too close? Sorry for all the question's and any help would be greatly appreciated.