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47 What do the H1, H2...H4 designations mean?




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This article is from the VW Technical FAQ, by with numerous contributions by Jan Vandenbrande others.

47 What do the H1, H2...H4 designations mean?

A: These are the type of Halogen bulbs used in US non-sealed beam lamps
(reflector & glass) since 1985 and longer for the rest of the world. The
same lamps are also used in fog/driving lamps. They are available in
regular strength (around 55 W) and more.
H1 - Single filament lamp
H2 - Single filament lamp?
H3 - Single filament lamp?
H4 - Dual filament lamp

These bulbs can be had at different strengths:
H1 55, 100, and 130 watt
H4 - 55/60, 55/100, 80/100, 80/130, 100/150 watt
Anything bigger than the 55/100 -100 H1 you must have relays or you will
fry the pins in the back of the fusebox.
Note that only the stock strength are strictly legal.

Tip: When installing new (Halogen) light bulbs in your car, make sure you
DO NOT touch the glass part of the light bulb with your fingers.
This is because the oil from your fingers gets so hot that it makes the
bulb really hot and it explodes. [If you do, clean it off with a high
concentrate alcohol: methanol, ethanol or isopropanol].

 

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