The chicks will let you know if it is too warm or cold. See where they lay. If they are spread further from the light, raise the bulb. If they are huddled real close and chirping a lot they are cold, lower the bulb or get high watt bulb. I take my chicks out fairly early. I place them in a wind-proof container after they are dried in the incubator and place them in the barn in a large water tank I purchased at a flea market for $45 (the bottom had several small holes). In the tank I have ample bedding, food and water at one end with a 125W heat lamp and another at the middle of the tank. I also add a bag of top soil at the far end (they'll eventually will love this). The tank is large enough for them to stay for several weeks. During the frigid months I will cover the tank almost all the way with a sheet of thin plywood.