Which statement best describes High-Intensity Discharge (HID) lighting?

Which statement best describes High-Intensity Discharge (HID) lighting?

• A. HID is a type of fluorescent lamp
• B. HID refers to incandescent bulbs
• C. HID is the same as LED lighting
• D. HID includes metal halide, high pressure sodium, and mercury vapor

Answer: (D)

High-Intensity Discharge lighting is a family of gas-discharge lamps that produce light by passing an electric arc through a gas or vapor at high pressure, and they need a ballast to regulate current. The common types in this group are metal halide, high-pressure sodium, and mercury vapor lamps, which deliver high lumen output and efficiency for large spaces like streets, warehouses, or gyms. They aren’t fluorescent lamps (which use phosphors to convert UV light), incandescent bulbs (which rely on a heated filament), or LED lighting (which uses solid-state diodes).

High-Intensity Discharge lighting is a family of gas-discharge lamps that produce light by passing an electric arc through a gas or vapor at high pressure, and they need a ballast to regulate current. The common types in this group are metal halide, high-pressure sodium, and mercury vapor lamps, which deliver high lumen output and efficiency for large spaces like streets, warehouses, or gyms. They aren’t fluorescent lamps (which use phosphors to convert UV light), incandescent bulbs (which rely on a heated filament), or LED lighting (which uses solid-state diodes).