Which types of lamps are used in an HID luminaire?

HID (High-Intensity Discharge) luminaires utilize specific types of lamps that produce light by passing an electric current through a gas, which ionizes and emits light. The two primary types of lamps commonly used in HID luminaires are mercury-vapor and metal halide lamps.

Mercury-vapor lamps were among the first HID lamps developed, and when energized, they produce a bright, bluish light. Metal halide lamps, on the other hand, are an advancement over mercury-vapor lamps, offering improved color rendering and efficiency, making them suitable for a wider variety of applications including street lighting, sports facilities, and indoor commercial spaces.

Because both types of lamps serve distinct purposes and offer different benefits in lighting, they are both included in the category of lamps used in HID luminaires. This combination allows for versatility in lighting design and application, which aligns with the answer indicating that both mercury-vapor and metal halide lamps are utilized in HID fixtures.

The other options provided mention specific types of lamps that exist outside the HID category, such as strobe and incandescent lamps, which do not operate on the HID principle, nor do they belong to the family of lamps typically found in HID lighting setups. Therefore, the correct choice reflects the