Has anyone tried this and been successful? I have an igloo cooler, fan, digital temp gauge that tracks his/los, will add water with sponge and hole to add water in lock-down. Do you think I could play around with bulb wattage or will it vary too much? I'm wanting to try a small hatch without one and wondering if anyone has had luck doing it this way? (I have my own fertile eggs to test on) Thanks!