I put up the 4' LED 3K lumen thingies. I think there are 11 or 13 or something split onto 3 switches in a 30x40 with 12.5' ceiling. Sides and middle on seperate switches. 1 over work bench/welding area, 1 over lathe. Autodimming welding mask dimming bright. I put the plugs in the ceiling on the switches so whatever they come out with next, I'll just mount and plug in "if" i ever need to replace a light.