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From: Daniel J. Stern on 4 Nov 2007 16:49
On Nov 2, 2:37 pm, N8N <njna...(a)hotmail.com> wrote:

> Unless I'm behind, the only glass lenses allowed are on sealed-beam
> type headlights. Aero-style *must* be polycarbonate.

Uh...no. Where'd this factoid come from? There has never been any such
a requirement. Glass lenses are perfectly legal under North American
headlamp regulations.

> ECE regs allow
> replaceable glass lenses

So do US regulations.

DS

From: Daniel J. Stern on 4 Nov 2007 16:50
On Nov 2, 4:35 pm, Ulf <a...(a)asdf.com> wrote:

> IIRC, it was/is Canada that required plastic headlights, unless they
> were hidden.

There's never been any such a requirement in Canadian headlamp
regulations.

DS

From: Daniel J. Stern on 4 Nov 2007 16:52
On Nov 2, 6:49 pm, Nate Nagel <njna...(a)roosters.net> wrote:

> were this my own car, an acceptable "fix" might be to simply break > apart
> the amber lens and shake/vacuum it out of the housing. then use a
> 3157NA bulb in place of the regular 3157.

Or a 5702KA, if you don't want to be replacing 3157NAs every month or
two. This works if the amber lens is only for colour and doesn't
contain any optics.

DS

From: Daniel J. Stern on 4 Nov 2007 16:53
On Nov 3, 9:31 am, Nate Nagel <njna...(a)roosters.net> wrote:

> According to Sylvania's web site, yes - 3157LL

Probably because Sylvania don't supply the correct bulb, which is
4114K (much longer life and slightly cooler running than 3157LL).

From: Daniel J. Stern on 4 Nov 2007 17:37
On Nov 2, 2:37 pm, N8N <njna...(a)hotmail.com> wrote:

> signal ambiguity... a good enough argument in and of itself
> for disabling them.

Yeah...I'm not so sure that's really been a problem. A little thought
with respect to implementation cuts it significantly, and proper
selection of light sources for adequately long life cuts it still
further. Other countries (e.g. Australia) have been eyeing the turn
signal DRL for use exclusively on motorcycles, to differentiate them
from automobiles. If that pans out as a beneficial measure, it'll be a
pity we won't be able to adopt it because of the existing installed
base of turn signal DRLs on cars and trucks.

But overall, if one cannot have a functionally-dedicated DRL, the turn
signal DRL is a great deal less problematic and potentially more
beneficial than any headlamp-based implementation.

There are some really nice LED DRLs presently and "coming soon", both
at the OE and aftermarket level. And BMW have just begun running extra-
bright inner "angel eyes" as effective nonglare DRLs in the daytime
and front position "parking" lamps at night - it takes more power than
turn signal or LED DRLs, but less power than headlamp DRLs.

And there's still a great deal of debate regarding the efficacy of
DRLs as a safety device. The matter is generally being decided in
various jurisdiction on political as much as safety grounds.

DS

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