seems car bulbs have OSP in the description now anyone know what the stands for
- posted
7 years ago
seems car bulbs have OSP in the description now anyone know what the stands for
Chris
Possibly OutSide Processed
I'd say that Chris is probably correct as OSP only seems to apply to amber indicator bulbs. (BAU15s)
Nice theory, but the bulb in the photo doesn't look to have offset pins and why would you need them in a single filament bulb?
Tim
Ah thanks never come across an Amber/indicator bulb that was like that
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Having googled a bit, it looks like the offset is pretty subtle (at least in the photos) and they do exist. I still don't understand why one would ever need offset pins for a single filament bulb though...
Tim
There are two types of offset. One is where one of the pins is further up the cap than the other. The second is where the angle between the two pins is something other than 180 degrees.
Yep, the latter type seems to be the one in the photo. But why??
Tim
So that you do not fit the regular equidistant bulb in its place. The OSP single filament bulbs are coloured orange, if you fitted a regular non OSP bulb then it would be a clear bulb and you would have white indicator light showing, which is wrong.
Dunno but you can get domestic fittings with the non-180 degree pins. The pins are offset to only accept low energy light bulbs which seem to be three times usual prices. I've only seen them in modern houses and they invariably get ripped out and normal bc fittings wired in so I'd guess that the car bulb has the offset for the same reason, i.e. to ensure that only a specified bulb is fitted.
Yes, in this case an orange one, or in the case of twin filament bulbs to ensure the right wattages are used (the only car I came across this on was certain models of Sierra, it foxed me for a while trying to get a regular stop and tail bulb in, only to realise that the pins were staggered and offset)
PROBABLY?!!!!
It's so well-known I'm slightly surprised the question was ever asked.
Chris
It's the orange tinted ones isn't it? So you don't put clear bulbs in there.
Well out of a half dozen of us two obviously didn't know.
Amber and clear bulbs have different pin arrangements.
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