I'm gonna try to find one. What I have been doing is letting them into the coop during the day and bringing them in at night but I can only imagine that this is incredibly stressful for them. I have 14 chicks.
Any incandescent will work. It doesn't have to be a heat lamp. The cheap household bulbs from dollar stores work fine.
Yesterday I found some big paw prints around my coops in the mud. I think they are mountain lion tracks. There were no claw marks like a canine would leave, just toe prints. They are around 4 inches by 3 1/2 inches. I took pictures but they are hard to see in the picture and my other guineas were running on them since I was trying to look at the prints.