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post #200 of (permalink) Old 7th June 2008
Technical Supremo

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Xenon bulbs work on the same principle as flourescent tubes and are known as discharge lamps. They have a ballast which converts the cars normal voltage to a much higher voltage which excites the gas inside the lamp causing it to glow. If the light burns dim it is either a bulb or ballast failure although their have been cases of water ingress around the ballast which cause a short.

Se the link below for after-market light, ballast and bulbs which are much cheaper than those from renault
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