Heavy-Duty Low Profile Die Cast Housing with Integral Heat Sinking, Driver Compartment, Mounting Arm Adaptor. Powdercoat Finish Over a Chromate Conversion Coating. Includes Twist Lock Photocell Receptacle. Tempered Clear Flat Glass Lens or Tempered Tempered Clear Flat Prismatic Glass Lens.Tempered Clear Flat Glass Lens or Tempered Tempered Clear Flat Prismatic Glass Lens.