Killark MBF391 - Ballast tank and splice box – corrosion resistant copper-free aluminum alloy. Baked powder epoxy/polyester finish, electrostatically applied for complete, uniform corrosion protection. All external hardware – stainless steel. Guard – copper-free aluminum alloy. Normally shipped as components for quick delivery. Refractor guard – steel with corrosion resistant finish. Reflector – lightweight, corrosion resistant fiberglass reinforced polyester. Fluorescent models furnished with lamps. Energy efficient instant on white light (2700K). 10,000 hour lamp life. HID lamp holders are E26 medium base The MB Series is a compact low bay light fixture using compact fluorescent and HID lamps. The design of the MB Series makes it suitable for harsh and hazardous environments using a cast copper-free aluminum. Its low profile and compact design allow the MB Series to fit in areas where larger fixtures would not fit while still supplying high quality illumination. - Class I, Division 2, Groups A, B, C, D - Class I, Zone 2, Groups IIC, IIB, IIA - Class II, Divisions 1 & 2, Groups E, F, G - Class III, Divisions 1 & 2