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. Popular for utility and roadway lighting, high pressure sodium has exceptionally high efficacy levels ranging up to 124 lumens per watt, making it one of the most efficient HID product lines at 24000 hr of life, they last longer than standard metal Halides and are also designed to be used in universal operating position.