[s-cars] Questions about the 9005 bulb "trick"

[A Ma]

Hi Dave,

I've been running this trick for about a year now. I think if you pool
enough 9005/6 bulbs from different manufacturers together you'll run into
some that match perfectly and some that will be off by a mm or so even among
the same bulb type. As to the ceramic cap, I don't think the glass projector
lense will be greatly affected by the extra heat, especially with the
cut-off shield. As to stray light, the cut-off shield should make the cap a
moot point. Just make sure your lights are properly aligned.

As a question to the list in general, I'm considering lining the inside of
the cut-off shield with aluminum foil or something equally reflective to
"recover" some of the light lost by the shield. I realize that it will
result in stray light but I'm curious as to where and how much. Any comments
about this or btdt?

Alvin
93S4

>From: Dave Forgie <forgied at direct.ca>
>To: s-cars <s-car-list at audifans.com>
>Subject: [s-cars] Questions about the 9005 bulb "trick"
>Date: Sun, 02 Mar 2003 11:11:50 -0800
>
>Being of Scottish ancestry (i.e. frugal) (forget the sheep jokes - those
>are for the New Zealanders), I am interested in the trick where a 65W
>9005 bulb is modified to fit in the 9006 (55 W) low beam position of the
>OEM DOT headlight housings.  I have down loaded the "More_light.htm" for
>the BMW E34 website and have checked out my spare 9005 and 9006 bulbs
>and have two questions:
>
>1.  The difference in the position of the filament in the two bulb types
>is about 1 mm.  Is this going to cause and problems, i.e. the beam being
>out of focus??
>
>2.  The OEM (say Hella) engineers obviously were thinking about
>something regarding the ceramic cap on the end of the 9006 low beam
>bulb, i.e. heat on the projector lense, focal points, stray light, etc.
>What are the downsides of no cap on the end of the 9005 65 W bulb?
>
>Dave F.
>
>
>
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