High intensity discharge (HID) lamp in which light is produced by radiation from sodium vapor under high pressure. Includes clear and diffuse-coated lamps.

A high-intensity discharge light source in which the light is primarily produced by the radiation from sodium vapor. Produces a slightly yellow light but has a very high energy efficiency.

An HID lamp that produces light from sodium vapor, producing a distinctly yellowish color. Used widely as streetlights.

Pressurized gas inside an arc tube is ionized by current flowing between electrodes, resulting in light being emitted. Contains sodium, mercury amalgam and xenon.