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high intensity discharge (halogene) (HID)

The HID lamp, High Intensity Discharge (HID), is an arc lamp, also known as Xenon lamp. It is a high pressure gas discharge lamp, which produces high brightness when gas discharge.

The high pressure gas discharge lamp consists of a discharge chamber in which an electric field is established between the cathode and the anode, which discharges in an arc. The discharge chamber of the HID lamp is filled with metal salt and inert gas, with the gas serving to ignite the arc. Once the arc is ignited, the metal salt is heated, it vaporizes and forms a plasma, which increases the resulting brightness while reducing power consumption.

Structure of a gas discharge lamp

Structure of a gas discharge lamp

The generated brightness of HID lamps is several times higher than that of halogen lamps. Whereas halogen lamps achieve luminous intensities of 20 mega- candela per square meter, the values for HID lamps are about five times higher, and this with lower energy consumption. The luminous efficacy of xenon lamps is around 90 lm/W.

Luminous efficacy in lm/W of various light sources

Luminous efficacy in lm/W of various light sources

HID lamps are available in a wide variety of metal halide, mercury vapor, sodium vapor and xenon arc lamp versions. These lamps differ in emitted color temperature and color rendering index. Xenon HID lamps can achieve color temperatures between 4,500 K and 15,000 K. To protect against self-destruction, HID lamps operate with ballasts or chokes.

Because of their luminous intensity, HID lamps are used in projectors and in automotive technology.

Informations:
Englisch: high intensity discharge (halogene) - HID
Updated at: 16.12.2015
#Words: 243
Links: human interface device profile (Bluetooth) (HID), also known as (aka), pressure, brightness, field
Translations: DE
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