Shop Lighting advice wanted/helps with my employment. 3 bay layout, with GIANT I beams coming down lower than lights mounting location
As far as wire size you could possibly use one 20 amp circuit with number 12 wire but if one light shorts out and trips the breaker you have no lights in the shop. Two 15 amp circuits would be better. Buy good lights from a lighting company and you get a better installation. Lowes, Home Depot and the other building supply places we have where I'm at don't have much selection and the sales people don't know much lights.