Hella TN4 fog lights

@70SATMan, Can you confirm that the diameter of the glass of these lights is 115mm, and that these are TN4 Hella 115's?

I'm now a little lost again. Hella 115s are not TN4s. Am I correct in that assumption? 115s were not legal in US but only ROW. Am I correct in that assumption? The Factory Installed Optionss brochure for 1969 states that above the bumper lights are quartz Iodine "Driving lights". And also option of white fog lights above the bumper. Porsche uses the word "driving" but to be correct it should be quartz iodine for the rest of the world only although it would appear to be available since it has a dealer price. Makes it confusing when Porsche uses the term "driving lights". I cant comment on diameter but Michael probably can. Sorry about rotation.

Tom, No, not exactly. This is an explanation in general terms about the Hella lights. Think of this in strictly aftermarket. When 118 or 115 is used, it’s a reference to the lens diameter. The case backs are the same size, use the same type of mount but, because of the differences in the lenses, uses different trim rings. Internally, there are differences in the cases meant for either the halogen 118 or the tungsten 115. So, swapping doesn’t really work unless one makes modifications.

‘118’ does not define a fog or driving style light. Within the Hella 118 series there are many variations. Clear, amber, fog, driving configurations. ALSO, different bulbs, H3 or H1. It was the halogen 118s that were not legal for the US (Porsche ROW)

There are similar different variations of the 115 in the aftermarket. US DOT recognized the Tungsten 115. Over the years I’ve read people claiming that TN1/TN2 lenses were also seen on the 914 115 lights but, I don’t buy that. Maybe later on, the TN1/TN2 version lens was made available as a spare. What I do believe is that Porsche only used the TN4 lens for the 115.

Got to take the translations in the manuals with a grain of salt. One thing for sure, Porsche was very careful stating which PNs were “For US only” or “Not for US”.

Hope this explanation helps.

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Originally Posted by 70SATMan

These are indeed fog lights and the version used for the NA market. It’s not the split that necessarily makes a lens for fog. It’s the size and shape of the flute. These are wider and deeper than used on a driving lens, creating a wider fan dispersal.

Technically, the US market did not have a driving light option. Fog lights pre ‘69 were the below bumper 128s. Those were dropped in ‘69 and replaced with the 118s/TN4s.
Of course one could work with the dealers back in the day or pick up a tourist delivery car and end up with the halogens. Porsche just couldn’t technically export a car into the US with the 118s.

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If I understand correctly, all pre '69 early 911's that have Hella 118's driving lights installed are not Original?

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Originally Posted by enoz05

If I understand correctly, all pre '69 early 911's that have Hella 118's driving lights installed are not Original?

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There are SWB brackets for TTG lights so,,, I don’t have any pre-69 parts manuals or brochures listing the early option codes. I can say that I’ve restored lights for a couple of ‘68 cars that reportedly had TTG lights originally.

Picked this out of the 1967 Tourist Delivery brochure. See the green car. Lights look larger than TN4 or Hella 118. Also checked the PET and info contained in the V Pages. Refers to Fog light and to "additional headlamps" for '69 and above. Also says they were sold as kits. All of that probably not much help with anything.Attachment 620056