I have our brooder set up waiting for our first batch of chicks and now that it's set up it seems like it might be too dark. We have an XL dark blue Rubbermaid bin with a ecoglow brooder, ventilation cut and covered in screen into the lid and a 4"x6" window in one end sothe kids can look inside. When you look in there through the window it seems dark.... Should I add a small/cool light in there for them?