High efficiency expansive cavity recessed fixture. Highest efficiency lensed fixture utilizing T5 or T8 lamps for significant energy savings. Computer designed optimized sloped housing shape. Tool less ballast access from below. All devices UL/CUL listed. Suitable for damp locations. Damp location emergency pack must be specified separately. Ballasts are energy saving, solid-state electronic. Ballasts and lamp holders replaceable without removing fixture from ceiling.