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What's the ballast metal halide?
2013-12-18 00:12:18

A metal-halide lamp is an electric light 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.Developed in the 1960s, they are similar to mercury vapor lamps,but contain additional metal halide compounds in the arc tube, which improve the efficacy and color rendition of the light.

Ballasts metal halide are required to start the lamp, regulate the lamp starting and lamp operating currents, and provide appropriate sustaining supply voltage. Starting the lamp: In MH lamps, ballasts provide the starting voltage and ignition pulses (pulse-start lamps) necessary to ignite the lamp. Probe-start MH ballasts, however, can take as long as 10 to 20 minutes to restrike (re-start) a lamp. Pulse-start MH ballasts can restrike the lamp within 2 to 8 minutes of an interruption in current, because they provide high-voltage pulses to start these lamps.


Regulating lamp current and power: The ballast regulates the lamp operating current flowing through the lamp after the lamp has been started. The ballast is set to deliver relatively stable power to the lamp while regulating the lamp current despite typical line voltage fluctuations. This maximizes lamp life and ensures other performance characteristics such as color and light output.


Providing appropriate sustaining voltage: Metal halide ballasts must maintain suitable voltage and current wave shape to the lamp. MH lamp voltage typically increases over time, and the ballast must continue to provide sufficient voltage to the lamp as it ages. In addition,


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