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There are not many brass base bulbs left in service these days. This is because aluminium is a cheaper product to use. The 130 volt rating is the maximum voltage that can be applied to the filament. Using this rated bulb on 120 volts will extend the lifetime of the bulb. Many traffic signal fixtures used 130 volt bulbs to cut down on maintenance of changing burnt out bulbs. Today most traffic light have been changed out to LED lamps that get about five times the life of the old incandescent bulbs.

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