I measure the temperatures with a non-contact infrared temp gun. The ambient temperatures are 70° cool side and 75° hot side. I think I'll go with heat lamp with a CHE or infrared bulb as suggested. I have an extra lamp that's a Fluker's 5.5" w/ dimmer but while it works overall, the dimmer switch doesn't. Would it still be safe to use or should I get a different one?