Need some info. here from experienced people. Grandson built the incubator (he's 13) for science project, Using a lightbulb and the temp. is all over the place and now varies 104 /96 degrees. the thermomator is not accurate and is new digital. I thought the eggs would not develope because of the fluctuation in temp. This is day 7 and I candeled some and to my surprise I see a dark spot and veins. The humidity varies from low 20's to 50%. I wanted to put in a stronger light bulb and now am not sure if I should do anything and just take my chances. I would really like to see these eggs hatch For the boys. There is a second incubator as a back up that is to hatcharound 4/5/16 so there will be chickens for the science project if the first clutch fails. Does the chicken embryo move in the egg? The one I candeled seemed to stay in one spot. Thanks for your help.