In Feb, when it was cold, remember?, we use 2 red heat lamps based on what I read here. One served as a back up just in case one when out and the house drops to 60 at night. We run TWO lines independently AND tieTWO strings, one to each line in case a line fails. THese came in later when the lambs were born in late Feb ( we bought another, and stole one from the chicks.). Premier 1 also make a very safe and more expensive model for those of you that might be interested. I only found 2 sources of red heat lamps, and we tried a lot of stores, HD, Lowes, severel feed stores too. ANd only the 250 watt; my girls want the light on even now (6 and 9 week LF) some sit under it and bake, others move FAR away . . . . would like to have 100 watt now.