The I-BEAM® fluorescent high bay is an ideal one-for-one replacement of common metal halide high bay systems. Applications include manufacturing, warehousing, commericial facilities and retail. The fluorescent I-BEAM fixture performs at mounting heights from 15'-40'. Certain airborne contaminants candiminish integrity of acrylic. Construction: Rugged fixture construction coupled with excellent fixture performance. Channel is formed of heavy-duty Code-gauge steel to stand up to the most demanding elements. Lamp holder assembly protects from incidental damage to reflectors during installation. Channel is high-gloss whitebaked enamel; five-stage iron phosphate pretreatment ensures superior paint adhesion and rust resistance. Optics: Two optical systems are available. Narrow distribution is ideal for narrow or aisle lighting applications and features precision-formed segmented optics utilizing Alanod Miro® 4 specular aluminum reflectors. Provides 95% reflectivity and warranted for 25 years. Wide distribution includes high-reflectance white finish for general or open areas. Electrical: Ballast: MVOLT 120-277V ballast accommodates most electrical requirements. Thermally protected, resetting, Class P, HPF, A+ sound-rated electronic ballast. AWM TFM or THHN wire used throughout rated for required temperatures. Sockets: Sockets include secure positioning rotating collars with enclosed contacts. Installation: Suitable for suspension by chain, cable or hook monopointhanger. Access plate on the back of channel housing allows for quick and easy wiring. Listings: UL Listed to U.S. and Canadian safety standards.