I am just setting up my basement studio too, it has 1 mid grade window so not much light either. My DH is going to put in ceiling mounted LED lights- the long ones in a unit that looks like fluorescent units. They are available at Home Depot. They give off good light, cost little to run and are not hot like the halogen bulbs. My room is 16' x 18' with a Tin Lizzie on one side, my sewing table, cutting center and an ironing area. He thinks we will need 4 units spaced around the room to give me good light. Two will be over the longarm, one over my sewing table and the other over the cutting station.