Hello! I recently got a (about) 5.5 by 3ft coop for my 4 hens. It is wonderful! They love it! I know that it is going to get much colder, and they will need a heat source. I want a light that gives off a good amount of heat, but not too much light. I was thinking about a heat light, but the only ones i've seen were huge (there may be smaller ones that i have just not seen). What kind of light should i use?!? Do they make mini heat lights?