The HID lamp uses a specially designed, internally c […]
The HID lamp uses a specially designed, internally coated quartz or aluminum tube, and through the tungsten electrode at both ends of the pressure arc, light emitted through the tube. The tubes are filled with gas and metal. The gas helps the bulb to start, while the metal heats up to the point of evaporation and forms a plasma to give off light.
The types of HID lights include:
Mercury vapor lamp (CRI range 15-55)
Metal halide lamp (CRI range 65-80, ceramic halide lamp up to more than 90)
Low pressure sodium lamp (CRI 0, because of its monochromatic light)
High pressure sodium lamp (CRI range 22-75)
The mercury bulb was originally used to produce Aquamarine light, and was the first commercially available HID bulb. Today, the school is closer to the light bulb has a white light. But mercury lamps have gradually been replaced by newer, more efficient, high pressure sodium lamps and metal halide lamps. The standard low pressure sodium lamp has the best efficiency in all HID bulbs, but their light is pale yellow. High pressure sodium lamps can now emit more white light, but at the expense of some efficiency. Metal halide lamps are less efficient, but they emit more white and natural light. There are also many colored metal halide lamps available on the market.