We set up our incubator last night (you can see some pics on my BYC page, nothing fancy. What you won't see there is the 12v computer fan we hooked up in there today for even air flow.)) and today I realize we're having a problem. The water heater thermostat is turning off at 105 degrees (I just need to set it lower so it goes off at 101) but then it doesn't come back on until 90 degrees. That's too much of a difference. So we're still experimenting. I'm wondering if a cooler light bulb would produce different results? But I'm doubting it. I think it has something to do with the water heater thermometer. It doesn't have two little setting arrows. Just one. Any homemade incubatorers out there who can suggest some solutions? We're in testing mode, eggs come this week.