I probrobly wouldn't use a regular bulb, I would just keep raising it to get to the right temp.I'm raising it every day. I just can't seem to get it to cool. It always stays right at 90 degrees. I turned it off for 15 minutes and went back in there and it was 80 degrees and they were all sleeping together under the light(that was turned off) the heat lamp is a 250 watt bulb. Should I switch it out for a regular light bulb? Like a 60 watt in the heat lamp housing? If I do that will the 'regular' light bother them as opposed to the red 'heat' light?