Another thing-----Just For Info----I build Alot of things, and I get alot of enjoyment doing this. I home-built my own incubator and have hatched over 2000 chicks with it in the last several months. When I build something I do my Home-work to find out what "it" needs to do----then I start building. Its no fun to me to build something that Is Not Going to work. When it comes to a incubator---there is not alot of room for mistakes and eggs are Not to forgiving if you are way off. If you can not get a thermostat to help you and you want to incubate some eggs. YOU will have to become the Human thermostat. You will need to increase your bulb size as mentioned to be able to get your temp up----a dimmer will help, but if you could afford that---get the thermostat mentioned first. You will have to stay real close to your incubator for 3 weeks, turning it off every time your temp gets up to 102(top of the eggs), turning it back on when it drops to around 100. Good Luck!