Lightweight industrial design with multiple hanging points including vertical from the end, vertical from the side and horizontal. Advanced wide T5 optical design for maximum coverage and diffusion. Prewired with either 120 or 240 volt 8 ft power cord for ease of use. Highly reflective aluminum insert for maximum performance. Cool operation housing design to keep electrical components thermally stable. Includes Spectralux? 54 watt T5 HO 6500øK Blue lamps. High lumen per watt rating. Energy efficient electronic T5 ballast. The 8 lamp fixtures has dual On/off switches each operating four lamps. The 4 lamp fixture has an on/off switch controls all four lamps. US Design Patent Pending No. 29/511,663 and Chinese No. 201530031833X. One year warranty on lamps.