My sewing room is in a finished attic eave, on the west side, with dark roof (never again). The central ac quit upstairs, and right now I keep kool by using a fan on a tall pedestal that occilates, and a ceiling fan. I use limited artificial light. My suggestion would to use only the lights that you need in the area that you are working. Unless you are doing close work, you do not need bright lights. I get hot when using my sewing machine, so I only sew in the morning.