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Thread: Porsche Headlight Table

  1. #11
    Senior Member M_deJong's Avatar
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    This is interesting. I’ve never seen a car wired so that both filaments of an H4 would be on at the same time. Seems to me it would overheat the bulb. Makes sense for an H1 though.

    I’m a bad person. I have H4’s in my ‘71... for the past 20 years. At least I don’t have the city lights wired in. In my ‘74 I do. For either car they are not original in the US. We were stuck with sugar scoops and sealed beams. So does it really matter?
    Mike de Jong | PCA - Early S - R Gruppe | '71 911T 2.40 Tangerine | '74 911S 3.2 Ice Green

  2. #12
    Senior Member Cliff's Avatar
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    Quote Originally Posted by 911MRP View Post
    Off top of head sure about the clear top rhd you mention.. so maybe was something swapped.
    Im being educated as we speak. I did read about & see an early LWB car with clear top H 4’s in the very early 90’s. That was it! So, yes, mine have the early Bosch asymmetric lens’s as on a 67s not the proper RHD type!
    To err is human; to blame it on someone else is more human...

    "You must always strive to be the best, but you must never believe that you are."
    —Juan Manuel Fangio[48]

    ”What would PORSCHE do”

  3. #13
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    Quote Originally Posted by M_deJong View Post
    This is interesting. I’ve never seen a car wired so that both filaments of an H4 would be on at the same time. Seems to me it would overheat the bulb. Makes sense for an H1 though.

    I’m a bad person. I have H4’s in my ‘71... for the past 20 years. At least I don’t have the city lights wired in. In my ‘74 I do. For either car they are not original in the US. We were stuck with sugar scoops and sealed beams. So does it really matter?
    For USA cars it may not matter a jot for reasons you and I touch on but for cars with H4 that were fitted on factory maybe does for folks aiming for authenticity spec or reading what still exists on their car to have a view on what factory parts might have survived. That's where the the subtle things like RHD LHD different part numbers, different date codes stickers that differentiate dates and parts and confirm other more detailed evolutions of H4 on some applications might matter to some owners. After all this forum sweats over hundreds of posts details of all manner of sad anorak authenticity things e.g. font size and machining of fairly generic once inexpensive German spanners a worker once picked up and put in a toolkit that are not even a particularly visible part of the car.... whereas others e.g. the use of the newly invented H4 bulb in headlamps that are different country regulated safety critical / quite prominent externally visible features ...not so much. I suspect my post on detail is seen as irrelevant and anorakish but spanner fonts not. Go figure!

    I research these things for my own education and interest and sometimes share here; hard to know why there is inconsistency of careing whether some specification minuteae is authentic gets attention and others seemingly not so important ?.

    Maybe info shared from a non USA forum member about a non USA spec lighting is of helpful to some.
    Last edited by 911MRP; 12-14-2019 at 05:46 PM.

  4. #14
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    Quote Originally Posted by Cliff View Post
    Im being educated as we speak. I did read about & see an early LWB car with clear top H 4’s in the very early 90’s. That was it! So, yes, mine have the early Bosch asymmetric lens’s as on a 67s not the proper RHD type!
    Mistype...meant not sure about in above now corrected. By the way clear top was not the early difference I piped up about initially

    Always happy to be corrected or learn if folks have more evidence on things I think I know.

  5. #15
    Senior Member Cliff's Avatar
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    Quote Originally Posted by 911MRP View Post
    For USA cars it may not matter a jot for reasons you and I touch on but for cars with H4 that were fitted on factory maybe does for folks aiming for authenticity spec or reading what still exists on their car to have a view on what factory parts might have survived. That's where the the subtle things like RHD LHD different part numbers, different date codes stickers that differentiate dates and parts and confirm other more detailed evolutions of H4 on some applications might matter to some owners. After all this forum sweats over hundreds of posts details of all manner of sad anorak authenticity things e.g. font size and machining of fairly generic once inexpensive German spanners a worker once picked up and put in a toolkit that are not even a particularly visible part of the car.... whereas others e.g. the use of the newly invented H4 bulb in headlamps that are different country regulated safety critical / quite prominent externally visible features ...not so much. I suspect my post on detail is seen as irrelevant and anorakish but spanner fonts not. Go figure!

    I research these things for my own education and interest and sometimes share here; hard to know why there is inconsistency of careing whether some specification minuteae is authentic gets attention and others seemingly not so important ?.

    Maybe info shared from a non USA forum member about a non USA spec lighting is of helpful to some.

    Owners prerogative to do as they please but doesn't mean you're not a bad a bad person for your longhood headlight high crimes and other misdemenours
    https://drivingintherealworld.com/pa...-daniel-stern/
    Daniel has a vast amount of lighting info.
    His web site https://www.danielsternlighting.com/
    To err is human; to blame it on someone else is more human...

    "You must always strive to be the best, but you must never believe that you are."
    —Juan Manuel Fangio[48]

    ”What would PORSCHE do”

  6. #16
    Serial old car rescuer Arne's Avatar
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    Quote Originally Posted by M_deJong View Post
    This is interesting. I’ve never seen a car wired so that both filaments of an H4 would be on at the same time. Seems to me it would overheat the bulb. Makes sense for an H1 though.
    I agree, seems like a bad idea for a dual filament bulb. But other RoW cars I've owned that used single filament H1s for each beam (mostly BMWs) have kept the low beam lit with the high beam. I really like that system.

    Quote Originally Posted by M_deJong View Post
    I’m a bad person. I have H4’s in my ‘71... for the past 20 years. At least I don’t have the city lights wired in. In my ‘74 I do. For either car they are not original in the US. We were stuck with sugar scoops and sealed beams. So does it really matter?
    My early '72 is in the paint shop now, I have a pair of H4s waiting to go in. I did have the city lights wired when I had these lights in my '84, but not in the '72. The H4s will be fine, although I'd prefer H1s just for the cool factor.
    - Arne

    In Progress
    - 1972 911T coupe, once again Silver as original
    Sold - 1984 911 Carrera coupe, Chiffon white; 1973 914 2.0, Saturn Yellow; 1984 944, Silver Metallic

  7. #17
    Hi John

    If I was able to buy a supposed NOS headlight for a 1973, H4 RHD with the Bosche name present but only raised on the inside of the lens not the outside is that an NOS
    headlight or a light made much later that 1973?
    Clyde Boyer


    1968 2.0 Coupe LHD, US delivered
    1972 2.5ST Coupe LHD Replica
    1972 2.4T/E Coupe LHD US delivered 68,000 miles from new
    1973 2.4E Coupe RHD Aussie delivered
    1973 2.4E Coupe RHD UK delivered
    1974 Alfa 2000 RHD GTV Coupe, 9500 miles from new





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