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.