The APP/APPV are T8 based deep cell parabolics designed to provide excellent lumination on the work surface. This luminaire provides a traditional 3"" cell louver into a 4-3/4"" deep fixture housing. This series is compatible with all of today's popular ceiling systems and is available with a number of configurations to fit your unique application. Certain airborne contaminants can diminish the integrity of acrylic components. Refer to the Material Compatibility tables for additional information.