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Mercury vapour light fixtures.
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Mercury vapor lights consist of a gas filled glass chamber protective glass bulb electrodes and a ballast.
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The outer bulb may be clear or coated with a phosphor.
A mercury vapor lamp is a gas discharge lamp that uses an electric arc through vaporized mercury to produce light the arc discharge is generally confined to a small fused quartz arc tube mounted within a larger borosilicate glass bulb.
Mercury vapor lamps are bright long lasting light sources that are often used to light large areas such as streets gyms sports arenas banks or stores.
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The protective bulb filters out harmful ultraviolet light and keeps the mercury gas contained if the inner chamber breaks.
The ballast sends electrical power to the electrodes which excites the gas and makes it glow.
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In either case the outer bulb provides thermal insulation protection from the ultraviolet radiation the.
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