I have been reading most of the posts on how to build your own incubator. It has been very helpful to say the least. Any how I have one built and in the process of getting it regulated. It is approximately 20" square by 20" high. I mounted a CPU fan in it and added a small night light wired direct so the temps would not drop too much when the thermostat shut the other light down. The other light is 60 watt and over night the temps only got to 90 degrees. Should I replace the small night light with another 60 watt bulb? I watched it for some time and did not see the thermostat shut off the main bulb.