I'm in the process of building my own cabinet style incubator, and I'm trying to figure out the most efficient heat source. I have seen many home-built ones with a porcelain socket and a lightbulb. I'm thinking of canibalizing one of my old Hovabators and mounting the heating element from that up top and incorporating a fan to circulate the air. I'd really appreciate any suggestions that others may have used successfully. Thanks in advance, Jim.