Okay, so last year I built my own incubator using a styrofoam cooler, water heater thermostat and lightbulb from some of the plans here on BYC. I have only run it twice. The first time I had 4 eggs and one hatched. The second time I had around 12 eggs and 4 hatched. Although, during this hatch we moved over an hour away. So, I believe that affected some of my hatch. It has been almost a year since then and I just dug the incubator out of the garage and cleaned it up. My question is for those of you out there that have DIY incubators. The last time I ran my DIY incubator I remember the light staying on for several minutes and then shutting off. My temperatures were all over the place. This time I set the thermostat at an angle away form the wall and moved the fan to achieve better circulation. Although, my light seems to come on for maybe 15 seconds and then turns off. Then it shuts off for 30 seconds or so then back on. My temp seem to be very level this time which is great but I am wondering if this will blow the bulb? I remember parents always telling me to quit turning the lights on and off or I would blow the light. My fear is that this will cause my bulb to go out and especially if it happens during the night when I am not keeping an eye on it. Can some of you share your thoughts? Is it okay? Also, what should the humidity be in the beginning? Thank you all in advance!