Heavy-Duty Low Profile Die Cast Housing with Integral Heat Sinking, Driver Compartment, Mounting Arm Adaptor. Clear Flat Glass Lens or Clear Flat Prismatic Glass Lens. Mounts on 23/8" Diameter Mounting Arm. Array Lumens: 17,685 (C Optic); 17,685 (F Optic). Delivered Lumens: 17,551 (C, Clear); 17,276 (F, Clear). Rated Life: 50,000 Hours. 5-Year Warranty. Aluminum LED Boards. 2.5KV Surge Protection.