Greetings: I live in Cambodia. So, words like "snow", "sleet" and "ice" simply do not come into conversations here. However, hammocks, bare feet, and drinking coconut water are common. We are about to build our first brooder / small coup for twenty (20) chicks, to start raising. On the page that lists the Home Made Brooders, it is not common to see one without a light source of some kind. So, even though temperatures here are no where near freezing (and getting a bit warmer every day), should I add one to this project? If so, should it be illuminated 24 hours per day? (I am assuming the primary reason for the lamp is to keep the chicks warm.) Come to think of it, should a light be left on in a chicken house (after the chicks are big enough to be transferred from the brooder) 24 hours per day? Would they eat more if they could see to do so later at night, thus growing faster? I tell ya, after losing the first flock my wife's family had at the farm (before I started getting involved), I have to say that I am a bit paranoid about losing the little guys before I even get them started. We plan on launching this about mid March.