The long body of linear vapor-tight fixtures illuminates a wide area in damp or humid locations, and provides more coverage than round fixtures. They surface mount to walls or ceilings and are commonly used to illuminate loading docks, basements, server rooms, and bus shelters. Their housing and lens fit tightly together and seal with a gasket to prevent dust and moisture from entering the fixture and damaging internal parts. They accept linear fluorescent light bulbs in a size that matches the fixture and with a base type that matches the fixture ballast.