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Marker light bulbs turning silver

466 Views 3 Replies 3 Participants Last post by  JamesGang, 
JamesGang
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I have a pair of marker lights on either side of my front fender. I have been replacing them, Type 57, about once every month. They are occasionally burning out, but usually I'm replacing them because of a silvery deposit on the inside of the bulb which reduces the amount of light they emit. Any ideas on what is causing this?
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DaveO430
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It is probably due to the vibration they get being on the fender. I don't know if LED bulbs are available to replace #57s but if you could find them they would last.
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Rudy
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The silver (not the metal) is from the filament. It is normal. You don't see it in larger bulbs as much because there is more glass surface to spread it over.
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JamesGang
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Thank you, Rudy. I wasn't aware it was a normal phenomenon. The silvery coating is so thick you can no longer see the filament!

Dave, I will look into LED's but, because of the orientation of the bulbs (facing forward), the light emitted needs to shine toward the side.
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