The protective bulb filters out harmful ultraviolet light and keeps the mercury gas contained if the inner chamber breaks.
Mercury vapour light fixtures.
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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.
The ballast sends electrical power to the electrodes which excites the gas and makes it glow.
Mercury vapor lights consist of a gas filled glass chamber protective glass bulb electrodes and a ballast.
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The bulbs have an inner quartz tube.
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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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In either case the outer bulb provides thermal insulation protection from the ultraviolet radiation the.