These high-quality T5 HO (high output) fixtures are fabricated and assembled in the USA with US and globally sourced parts. They feature reliable, name brand ballasts designed to operate at 277 Volts. They are hard wired with a 6 ft power cord with a NEMA L7-15p plug. The reflectors are made with 95% reflective German aluminum for maximum reflectance & uniformity. Purchase your choice of lamps separately. US Patents: D543653, D543654, D544981, D544985 & D544626.