For surface ceiling-mount applications that require the clean appearance of a flat-bottom diffuser. Provides high light levels for storage rooms, offices or retail applications.ConstructionFlat-bottom acrylic prismatic diffuser. Matches CS Series in appearance.Full-depth, white enamel end plates.Linear side prisms control brightness; pyramidal bottom prisms minimize lamp image.Diffuser hinges open from either side for easy cleaning and service.For surface or stem mounting (4' models only), unit or row installation.For unit mounting, two stems are required. For row installation, one stem accessory per fixture plus one per row required.