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Imperial Wizard...
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My high power 80/100 bulb went out after about 3 years 2 on old bike and 1 year on new....the question what does the metal chrome "cone" on a stem do..looks like a chrome "dipper" ..it goes down into the H/L lens...what that thing do and do ya realy need it ? looks to me all it does is make your bulb get hotter thanks lake....PS working on it now so help fast...thanks...:laugh
 

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You don't really need it with an H-4 bulb, H-4 bulbs are black on the very end, to do the same thing. Keep from having a "hot spot" right in the middle of the lens It doesn't hurt anything, but it's not needed.
 
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