Metal Halide Lamp Construction And Working

History of the metal halide lamp.

Metal halide lamp construction and working.

The content of video will be iti level. A halogen is a monovalent element which readily forms negative ions. The basic construction of the lamp is two envelopes an inner envelope arc tube which contains the arc and the outer envelope called bulb which filters out the uv and shields the inner arc tube. Full light output does not occur immediately when power is applied to any metal halide lamp.

This group includes the mercury vapor high pressure sodium and metal halide lamps. A metal halide lamp is an electrical lamp that produces light by an electric arc through a gaseous mixture of vaporized mercury and metal halides compounds of metals with bromine or iodine it is a type of high intensity discharge hid gas discharge lamp. Schematic diagram of a metal halide lamp is shown below. 1 how it works.

The basis for the metal halide lamp starts all the way back in 1912. The auxiliary electrode or starter electrode near the main electrodes attached to the glass stem creates initial discharge between them. A researcher by the name of charles p. Ignitor a device either by itself or in association with other components that generates voltage pulses to start discharge lamps.

When full voltage is applied across the main electrodes no arc is produced at the time of switching. There is a time delay of at least two to four minutes after starting before lamps reach full light output. Probe start metal halide lamps will start at an ambient temperature of 30 c 22 f or higher. Capacitor a device used in electric circuitry to temporarily store electrical charge in the form of an electrostatic field.

Like fluorescent lamps hid lamps produce light by the excitation of a gas confined between a pair of electrodes and require a ballast to limit current draw and to provide proper starting and operating voltages. Developed in the 1960s they are similar to mercury vapor lamps but contain additional metal halide compounds in the quartz arc tube. Metal halide high pressure sodium and mercury vapor are types of hid lamps. Detailed vdo about metal halide lamps its construction working and advantages all are discussed in detail.

The lamp uses mercury vapor to create the powerful light like the high pressure mercury vapor but includes other metals halide salts to improve the color. A halide is a chemical compound of a halogen combined with an electropositive element or in the case of lamps.