What are high intensity discharge (HID) light bulbs?
High intensity discharge (HID) light bulbs contain varying amounts of mercury. The amount of mercury can vary depending on the type of HID light bulb. The three most commonly used types of HID light bulbs are mercury vapor, metal halide, and high pressure sodium. HID light bulbs are typically used when high levels of light are required over large areas and when energy efficiency and/or long life are desired. These areas include gymnasiums, large public areas, warehouses, outdoor activity areas, roadways, parking lots, and pathways. HID light bulbs, especially metal halide, are increasingly used in small retail and residential areas.
