High intensity discharge, or HID lamps, as they are commonly called, are a lighting mainstay for commercial applications, indoors or out. our HyGrade™ brand covers all the HID technologies; mercury vapor, metal halide and high pressure sodium. Manufactured to the highest quality standards, our HID lamps are in-service in virtually every state, in every type of business. Satco HyGrade™ high intensity discharge lamps are perfect for large indoor or outdoor open areas such as parking lots, street lighting, warehouses, anywhere high lumen output is critical. designed for general lighting purposes, mercury vapor lamps are a lower investment option to HID technology. In addition to lower initial costs, at 24,000 hours, this product line also decreases replacement and labor costs because of their longer life option.