2024 Author: Priscilla Miln | [email protected]. Last modified: 2023-12-16 00:21
Metal halide lamp belongs to the class of gas discharge lamps. In their work, such devices use a gas discharge, and not the thermal glow of an incandescent filament. Such lamps can be called relatively young light sources, the history of which is no more than fifty years old. Their birth is associated with a number of experiments by scientists to improve gas-discharge mercury lamps. From the point of view of the filling, their distinguishing feature is the use of mercury vapor, a composition of s alts and gases as a working mixture. The composition of the s alt mixture affects the shade of the emitted light. A metal halide lamp can emit bluish or reddish light. Inside the flask, the gas is under very high pressure.
Features of device operation
Metal halide lamps are switched on in the same way as fluorescent lamps, as well as other gas discharge lamps. For ignition, they require a connection to the network viaspecial start-control equipment. When it is turned on in the lamp, a discharge in argon first occurs, which starts an electric arc between the electrodes of the lamp bulb. In the off lamp, mercury and s alts settle on the walls of the flask in the form of particles. After starting, the electric arc instantly heats up the flask, evaporating solid particles, after which the discharge continues in s alt and mercury vapor. The first minutes the temperature increases very much, as does the brightness of the radiation. During operation, a metal halide lamp heats up to a temperature that exceeds a thousand degrees, which is why the spotlights in which such devices are used are so large. To cool them, a large metal surface of the spotlight is needed.
Philips metal halide lamps are much more efficient than fluorescent lamps, as almost 24 percent of the energy consumed in this case is converted into light. Such products are produced in a fairly wide power range - 20-20000 watts, which allows them to be used everywhere. Design features change according to lamp power.
Application areas
A low power metal halide lamp can be used in the same place as a traditional halogen lamp - in appliances for the office, home, advertising, inside museum displays and shops. It is much more economical and efficient than halogen, but requires additional ballasts.
Metal halide lamp 150wuseful for lighting a large room or for a lamp in the courtyard of a private dwelling. High power fixtures are suitable for professional lighting equipment such as high power spotlights, theater spotlights, photo and movie lighting equipment, as well as some types of projectors.
An interesting area of use for metal halide lamps can be the lighting of greenhouses and aquariums. They have a spectrum of radiation that is favorable for the growth of plants and corals.
Such devices can be produced with two flasks - external and internal. It is believed that this option has improved color characteristics.
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