When I rewired the detached garage I put outlets in the ceiling for the lights and tied them to a light switch. The garage is two cars wide by two cars deep; 14 foot high ceiling on one side. PO built it to store their RV. Lighting is the two original 8 ft dual T12 bulb florescent fixtures on the center beam and 7, four foot, four T5 bulb, florescent fixtures. Predates LED fixtures. As one gets older, more light is better. A few years ago had a couple 8 ft florescent fixtures replaced with 8 ft LED fixtures from Lowes (I think) in the attached garage. No issues.