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. Pre-wired 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 6500°K Blue lamps. High lumen per watt rating at 5,000 lumens per lamp. Energy efficient electronic T5 ballast. The 8 lamp fixtures have dual on/off switches each operating four lamps. The 4 lamp fixture has an on/off switch that controls all four lamps. US Patent: D757,327 and US Patent Pending: 29/561,608. Chinese Patent: ZL201530031833X. One year warranty on lamps.