headlights

[Bob Rossato]

> The OEM Euro headlamps for the Audi 200 will use H4 builbs for main beam.
> The H4 bulb is a two filament bulb.  High beams are augmented by an inner,
> "driving" beam, which is a single element H-3 bulb.  There is no
> H1 element
> used in any Audi headlamp made within the last, oh, 20 years, I don't
> believe, although the last of the quad headlamp cars would accept a
> replacement high beam unit that would have used an H1 bulb.  (The
> H1 bulb is
> pretty much in decline now, due to its long size and relatively short life
> span)  The H2 bulb is normally used only in fog and driving light
> products.
> It is considerably larger than an H3 bulb, and offers little
> advantage, but
> for some installations is used.

The H1 bulb is used quite a bit in the Euro lights.  The Euro 3 beam
headlights for the '92-'97 UrS4/6 and '95-'97 A6 used H1 bulbs for both the
low beam projector and the high beam, and H3 bulbs for the projector fogs.
The Euro 3 beam, non-xenon, headlights for the newer A3/A4/A6/A8 line use H1
lows and H7 highs.  And the Cabrio used the H1 highs until it was phased out
in 2000.

The H1 seams to have been displaced by the H7 after '00 in the high beam
application, but the newer cars still use it for the low beam non-xenon
projector.  So as xenon becomes more and more standard fare, the H1 will be
soon be phased out.  But for now it's still being used.

Bob