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The most common reason for this is getting skin oil onto the bulb during changing of the bulb. This will kill most every bulb on the market today. This creates hot spots on the bulb which will cause the filaments to burn out at an accelerated rate. If you aren't already, use clean, new, nitrile gloves to keep the oil off. If you don't have nitrile gloves, ...


1

Another surprisingly common problem is water in the headlight lenses (ie uin the unit iteslf), especially after heavy rainfall. It forms a puddle at the bottom of the unit until maybe you hit a bump or brake hard, then splashes up & hits the bulb itself .. zap! temperature difference upsets the bulb. Have a close look at the light units from the outside ...



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