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There is a German national regulation for vehicle bulbs, now superseded by international ECE regulations. Bulbs according to the old German regulation are still manufactured. The German regulation is contained in §22a, Subsection 1, No. 18 of the Straßenverkehrs-Zulassungs-Ordnung (StVZO, Road Traffic Approval Regulation).
The H1 lamp uses a P14.5s base in accord with IEC 60061. [1] This is a round metal prefocus base 14.5 mm in diameter with a flat and two dimples so the H1 can be installed in a lamp only in the one correct orientation. There is one 6.35 mm male spade terminal in the center of the base, through which power is supplied.
The reference designator usually consists of one or two letters followed by a number, e.g. C3, D1, R4, U15. The number is sometimes followed by a letter, indicating that components are grouped or matched with each other, e.g. R17A, R17B. The IEEE 315 standard contains a list of Class Designation Letters to use for electrical and electronic ...
Filament type (axial vs. transversal) is interesting to know, since the best type for distant light projection is the axial type. Tranverse filament types usually render inferior light patterns, but could be useful when a wide pattern is desired (as in fog light headlamps).
Where is the brightness? And where are the older bulbs? I don't see my 97, 97A, 168, 194, 1156, 1157, 1157NA, etc. Nor is bulb # 550 (happens to be for a Map light on a 1968 Cadillac) listed. This list is so incomplete as to be useless to an automotive restorer. Source: Cadillac Division of General Motors Corp; 1968 Cadillac Shop Manual, page ...
Some recent [year needed] vehicles use small halogen bulbs for exterior signalling and marking functions, as well. [citation needed] The first halogen light approved for automotive use was the H1, which used 55 Watts producing 1500 lumens and was introduced in Europe in 1962.
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