The red lamp discourages pecking and cannibalism. I always use at least 1 extra lamp in case one goes out. The deal with temp, is that the chicks will find the temp that suit them at the time. That is, if they need warmth, they will go directly under a lamp. If they get hot they will move away. If all of the chicks are at the far reaches of the brooder guard, then your light may be too low. Conversely, if they are all huddled under the lamp, then its too high. I use 250 watt bulbs and hang them at 18 inches for the first week and then slowly raise them a couple of inches each week. Make sure you lamp fixture contains a porcelain socket! Reflector heat lamps can get hot enough to melt plastic and cause a fire. PS. My brooder house is unheated and not part of my home.