I was looking for something in the barn the other day and found a Brower model 1680-2 brooder in the loft. Today I plugged it in and it works! But now I have questions, What kind of light bulb should I put in it? It has a heater so I assume I don't need a heat lamp. Second: what is the curtain for? And finally one of the roof panels is insulated, does this go in the front or the back? Thanks for any assistance!