1. High pressure die cast aluminum alloy housing for corrosion resistance. 2. Anodized aluminum reflector and clear tempered glass lens are designed to optimize light distribution. 3. Optional twist-lock photocell available upon request. Lamp:70-100W Circular loop induction lamp with high lighting efficacy at rated 80, 000hrs lifetime, about 20 years burning on 4000hrs/year. Electronic Ballast features high power factor, flickering free, constant output wattage, and safe protection.