In article ,
Dave W wrote:
That entirely depends on the type of headlight. Projector types - with a
bulls eye in front of the bulb - are very tolerant of bulb type.
Tungsten, HID or LED all give a similar and well controlled beam pattern.

You'll see that demonstrated on U Tube if you're interested.

I would dispute that - some cars give a dazzling blue side spill due
to the non-achromatic lens.

If it gives a dazzling side spill, that will show up in the beam pattern?

Most of these projector lights produce a spike of light to the left which
lights up the side of the road way beyond the range of the main part of
the dip. If a car is parked on the wrong side of the road, headlights on,
oncoming cars get the full force of that spike.
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*A fool and his money are soon partying *

Dave Plowman London SW
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