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head lights

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head lights

Postby vinnytruck » Thu Jul 13, 2017 6:07 pm

Hi Guys, heres a question: started my light work today and noticed that my head lights have a blue dye inside?, or blue smoke? what is that and why is it happening? one bulb brand new the other is 10 yrs. old but both have that blue shade to them. Anyone have a answer, thank in advance VT
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Re: head lights

Postby m-37Bruce » Sat Aug 12, 2017 7:12 pm

Not a clue, are you all stock, 24 volt?
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Re: head lights

Postby ZGjethro » Sat Aug 12, 2017 8:40 pm

Sorry, I have no idea. My stock headlamps are a very dim and yellow color compared to modern headlamps. And my gauges say the truck is running at a good voltage. I'd like to swap 'em out for 24v LED lamps, but I can't justify the expense. It's not like I'm outdriving the headlights at 40 mph!
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Re: head lights

Postby vinnytruck » Sun Aug 13, 2017 9:26 am

thanks guys for the reply. Yes I am stock and puzzled...hope someone has insight on this, I dont want them to EXPLODE. VT
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Re: head lights

Postby vargaspj » Mon Aug 14, 2017 11:29 am

I think those are sealed beams with the air evacuated like a tube.
Back in the old days of vacuum tube technology there would be a dark spot called a "getter" on the inside surface of each tube.
As part of the evacuation process at the very end after the tube was sealed the getter would be excited; when it flashed it would remove impurities from the trapped air in the vacuum tube.
This might be what the dark spot is on the inside of your sealed beam headlight (just part of the normal sealed-beam manufacturing process).
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Re: head lights

Postby vinnytruck » Mon Aug 14, 2017 5:22 pm

thank you VAR,
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Re: head lights

Postby rickf » Tue Aug 15, 2017 8:15 am

Blueish smokey color is usually an indication that the bulb is about blow, not explode, just blow out. The new replacements from overseas tend to do this very quickly.
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Re: head lights

Postby vinnytruck » Tue Aug 15, 2017 1:45 pm

thank you rickf VT
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