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High Intensity Discharge (HID) Lamp

HID explained… How does it work?

HID (high-intensity discharge) lamp is a type of electrical bulb which produces light by means of an electric arc between tungsten electrodes housed inside a translucent arc tube. This tube is filled with both gas and metal salts. The gas facilitates the arc’s initial strike via a high voltage pulse produced by the igniter. Once the arc is started, the ballast maintains a constant arc which evaporates the metal salts forming a plasma. This greatly increases the intensity of light produced by the arc and reduces its power consumption.

HID requires three components: a bulb, an igniter and a ballast. Instead of a filament, HID is a xenon gas filled bulb with 2 electrodes. Applying a high voltage 20,000 volt pulse (via the igniter) a plasma arc is formed across the two electrodes in the bulb. Once ignited, the ballast takes over, keeping the bulb running at a constant temperature. HID lights take approximately 15 to 25 seconds to reach a stable brightness, a fact not all buyers know.

Bulbs And Ballasts
PAST • PRESENT • FUTURE

PRE 1970’s – OLD TECHNOLOGY • LAST CENTURY Incandescent bulb makes light by heating a metal filament wire to a high temperature until it glows. The hot filament is protected from air by a glass bulb that is filled with inert gas or evacuated low luminous efficiency.

1980’s – PRESENT TECHNOLOGY Halogen, is an incandescent bulb with a tungsten filament contained within an inert gas and a small amount of a halogen such as iodine or bromide. The combination of the halogen gas and the tungsten filament produces a chemical reaction known as a halogen cycle which increases the lifetime of the filament and prevents darkening of the bulb by redepositing tungsten from the inside of the bulb back onto the filament. Because of this, a halogen bulb can be operated at a higher temperature than a standard gas-filled lamp of similar power and operating life. The higher operating temperature results in light of a higher colour temperature This, in turn, gives it a higher efficiency. Due to their smaller size, halogen is more efficient in how they create light.

THE FUTURE – BRIGHTER • WHITER • LIGHTER HID (high-intensity discharge) lamp is a type of electrical bulb which produces light by means of an electric arc between tungsten electrodes housed inside a translucent arc tube. This tube is filled with both gas and metal salts. The gas facilitates the arc’s initial strike via a high voltage pulse produced by the igniter. Once the arc is started, the ballast maintains a constant arc which evaporates the metal salts forming a plasma, which greatly increases the intensity of light produced by the arc and reduces its power consumption.

Compared with incandescent bulbs, HID lamps have higher luminous efficiency since a greater proportion of their radiation is in visible light as opposed to heat. Their overall luminous efficiency is also much higher: they give a greater amount of light output per watt of electricity input.

HID … THE FUTURE OF LIGHTING

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