Metal Halide Lamp Construction And Working

A halide is a chemical compound of a halogen combined with an electropositive element or in the case of lamps.

Metal halide lamp construction and working.

Metal halide high pressure sodium and mercury vapor are types of hid lamps. The content of video will be iti level. Schematic diagram of a metal halide lamp is shown below. Metal halide lamps belong to a family of high intensity discharge hid lamps that includes mercury vapor and sodium vapor lamps.

Ignitor a device either by itself or in association with other components that generates voltage pulses to start discharge lamps. Developed in the 1960s they are similar to mercury vapor lamps but contain additional metal halide compounds in the quartz arc tube. The basis for the metal halide lamp starts all the way back in 1912. How does a metal halide lamp work.

1 how it works. This group includes the mercury vapor high pressure sodium and metal halide lamps. 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. A halogen is a monovalent element which readily forms negative ions.

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. 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. Capacitor a device used in electric circuitry to temporarily store electrical charge in the form of an electrostatic field.

A researcher by the name of charles p. Steinmetz was the first person to take a mercury vapor lamp and use halide salts in an attempt to produce a better light color. Probe start metal halide lamps will start at an ambient temperature of 30 c 22 f or higher. The auxiliary electrode or starter electrode near the main electrodes attached to the glass stem creates initial discharge between them.

History of the metal halide lamp. Full light output does not occur immediately when power is applied to any metal halide lamp.