[urq] HIDS

Buchholz, Steven Steven.Buchholz at kla-tencor.com
Wed Jan 31 16:37:23 EST 2007

Thanks Steve ... that is precisely the detail I was looking for ... my position was the same as Ingo stated, and it seemed to me you could even investigate creating an extra circuit so that the "flash to pass" switch activated only the H1s, but the high beam switch would activate the high beams in the H4.  It may not have been possible depending on the internal construction of the headlight switch ... but now I know it isn't even worthwhile considering the dual capsule H4s.  

... I must say I'm liking the SilverStars though on the motorcycle ... maybe that will be my next experiment.  

Steve B
San José, CA (USA)
> Well, yes, there is a reason not put them on the brights.  HID ballasts and
> bulbs don't like to be turned on and off rapidly, which you would do if you
> "flash to pass".  The new Audis with "bixenon" HIDs use one bulb with a
> movable shutter that changes from low to high.  The dedicated high beam is
> still a halogen bulb, which can survive the flash.  If you don't flash to pass,
> then an HID high beam would be great.
> I don't like the idea of the "dual bulb" H4s that use two HID capsules for the
> above reason as well as the fact that the two bulbs cannot be positioned
> properly due to the nature of the HID capsule. On a true H4 bulb, the high and
> low beam filaments are coaxial, which is not true of the dual bulb HID. Some
> of the HID kits that you can find now use a motor or solenoid to move the bulb
> so that the capsule is in the proper position for low and high beam.  So, when
> you go from low to high beam the bulb moves without turning off the capsule.
> To me, the ideal HID H4 replacement would be the motor/solenoid equipped,
> single bulb unit with 4300k color temperature.  You MIGHT go to 6000k if you
> want a little more blue (I don't, I would rather have the extra brightness of
> the 4300k bulbs), but you definitely do not want more than 6000k.  I drove an
> ur quattro with 10000k bulbs, and they were awful.  The light was an eye-
> straining purple and did not provide even as much light as a halogen.

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