Text 14844, 131 rader
Skriven 2005-10-16 18:10:06 av Roy Witt (1:1/22)
  Kommentar till text 14810 av Michiel van der Vlist (2:280/5555)
Ärende: looters in NO
=====================
16 Oct 05 10:38, Michiel van der Vlist wrote to Roy Witt:

 MV>>>>> I would be surprised if you did not have something similar.
 >>>> Be surprised, then.. I had to look this one up as I did not
 >>>> know for sure, but our taillights are generally 27 watts
 >>>> each to begin with.
 MvdV>>> But... that would be blinding in clear weather.... :-(
 >> Ray has probably mistaken the 27/7 rating for these bulbs as
 >> their normal wattage while in use.
 MvdV> Plus that he mixid up "tail light" and "brake light". yes we yoo
 MvdV> have these dual filament bulbs where the same light serves as the
 MvdV> rear light and the brake light.

As do most vehicles.

 >> It's actually the maximum wattage they'll withstand.

 MvdV> All the bulbs here are labeleed !2 Volts XX watts. That would
 MvdV> suggest the Wattages is when 12 Volts is applied. Whle driving that
 MvdV> could be significantly more as the voltage will be higher. Up to 14
 MvdV> Volts...

Ours only come with the voltage on them. Nothing much about wattage or
amperage. True about the voltage, most generating systems are set to
provide 13.8vdc, but 14 is probably within limits.

 >> These light bulbs are a #2057 or 3157, which are dual filament
 >> bulbs. They're rated at 7 watts maximum while being used as a
 >> taillight, but are rated at 27 watts maximum total when the bulb
 >> is also used as a brake or turn signal light.

 MvdV> Combining turm signal lights with brake lights is very rare here.
 MvdV> You only see it on old American cars.

The trend has been since the mid 1980s to put a third brake light
somewhere higher than the taillights are located. Sometimes they were in
the back window, and, as you could see in the rear view photo of my
Camaro, the third brake light is in the spoiler, just below the hatch
window.

 MvdV> My father's Ford Mainline had it. But that was ages ago... European
 MvdV> cars have separate amber turn signal lighths. The tail and brake
 MvdV> lights are red.

Look close at the rear of my Camaro and you'll see red, amber and a white
or clear back-up lamp. On the front, it has amber daytime running lights,
which turn off when the head lights are on.

 >> The brake light is 20 watts maximum, while the tail
 >> light remains on at 7 watts maximum.
 MvdV> Well, that is more or less the same as it is here then.
 MvdV>>> Wow, that is a heavy fog. Very rare here.

 >> I've driven in worse fog than that. No visibility beyond the
 >> hood. I was lucky and fell in behind a semi-trailer combo.
 >> He was travelling at 70mph in dense fog

 MvdV> That sounds very dangerous. If he was above the fog, he could see
 MvdV> where he was going, but could not see low objects blocking the
 MvdV> raod. Ojects such as a Camaro....

I was in a VW beatle. The stopping ability of the VW vs the Semi would be
just about 5 miliseconds less than my reaction time. That evening, that VW
got nearly twice the fuel mileage it normally got, because that semi
'sucked' that VW along.  In the racing world here, that's called
'drafting' ... I did that one more time on a trip back from Phoenix to San
Diego with my old Firebird. It used to get 12mpg, but got 18mpg that day.

 >> and I tailgated him, riding his taillights all the way from
 >> Fresno, CA to the Grapevine, which is a mountainous area just
 >> north of Los Angeles. Apparently, there was no fog where he
 >> sat, but there was plenty looking out of the VW windshield
 >> I was driving.

 MvdV> If the fog was as dense as you suggest and you could make out his
 MvdV> tail lights, you were much to close to him at 110 km/h I'd say...

I'm sure the semi driver never knew I was there and I'm a much better
driver than average. I wasn't the least bit worried about it.

 >>>> Fog lights to us are forward-facing and used in conjunction
 >>>> with headlights. Mine, for example are a halogen-beam with a
 >>>> flat pattern rather than the slightly more dispersed beam of
 >>>> the regular halogen headlights.

 MvdV>>> Those were quit popular in the past here too. But with
 MvdV>>> ever more crowding of the roads their popularity has
 MvdV>>> dwindled. They are no good if there is someone driving
 MvdV>>> in front of you, and over here having the road to
 MvdV>>> yourself is rare.

 >> They're used with or without fog here.

 MvdV> Over here they officially may be used only when the main headlights
 MvdV> are off...

Wish that were true here.

 MvdV>>> I am starting to wonder you aren't using a different
 MvdV>>> definition of "Watt" from ours. They must be almost blind
 MvdV>>> if people can not see the standard 21 Watt reverse light...

 >> They're rated at 27 watts, but that doesn't mean they use that
 >> much power.

 MvdV> Right. All a matter of labelling then. Over here they are labelled
 MvdV> 12 Volts, 21 Watts. Looks like that is the same as your labelled 27
 MvdV> Watts. (At 14 Volts...)

They're not labled as such, I had to look them up in a database of
automotive bulbs.

 >> Most bulbs of that category are also rated by amperage. and
 >> 1.2 amps means the bulb is using 15 watts at 13 volts.

 MvdV> I am familiar with those formulas, I am a HAM remember. ;-)

That's why I didn't elaborate any further than I did.

 >> If you're getting maximum voltage at the taillight socket, 14vdc,
 >> then your 1.2amp bulb will be using 17 watts.

 MvdV> The current is not a constant. When the applied voltage is
 MvdV> increased, the current will also increase....

true.


Roy
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