Each space is different, depending on your ceiling height, number of light fixtures and location on the ceiling/spacing, the type of project you are trying to complete, and many more factors. As a very broad guide, you would want: between 2,500-5,000 lumen for a 1-car garage with 10ft ceilings, between 5,000-10,000 lumen for a 2-car garage with 10ft ceilings; above 10,000 lumens for a 3-car garage or any space with ceilings 12 ft and higher.