External Material:Exposed metal is low copper aluminum alloys, 6063 extruded housing.Lens:Cast DR Acrylic, resistant to UV and thermal shock.Gaskets:High temperature silicone seals resistant to ozone, and UV degradation in the lamp and ballast chambers, neoprene rubber in the junction box enclosure.LED Array: (8) LumiLeds Rebel LEDs delivering approximately 1090 lm. It runs at approximately 18W.Optics: Secondary side emitting lens for each LED.