I've used the white christmas lights for the last couple of years and it seems to work well and it's easier on the electric bill. My polish, however, will not lay during the winter no matter what kind of light, food, treats or any other kind of bribe I might offer. I think they would prefer to be a snowbird!Are x-mas lights enough? For some reason I was thinking I would need those great big 240 watt brooder lights. Lol