As their name implies, high-bay lights are used to illuminate spaces with high ceilings. That usually means ceilings ranging from 20 feet to approximately 45 feet. Low-bay lights, on the other hand, are used for ceilings 20 feet and under. Because a high-ceiling location has more space to fill, a high-bay by definition is a powerful light source that can brighten up a large area.Given their placement, high-bay lights are natural fits for commercial and industrial uses. They have multiple applications across a range of industries, including workshops, factories and assembly lines. You will also see high-bay lights in large recreational facilities and gyms. These lights are excellent for illuminating storage facilities and warehouses as well.