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From: Jane Galt on 8 May 2010 01:34 SMS <scharf.steven(a)geemail.com> wrote : > Jeff Strickland wrote: >> "Jane Galt" <Jane_G(a)gulch.xyz> wrote in message >> news:Xns9D6FE9154DD23JaneGgulchxyz(a)216.196.97.142... >>> Do they make LED replacements for the instrument bulbs? I'm wondering >>> if that >>> would be a good or bad thing? >>> >> >> No, they do not. This is at least in part due to the fact that the >> bulbs can be dimmed, whereas LEDs are either on or off. > > Not true. You dim an LED by reducing the current, while an incandescent > bulb is dimmed by reducing the voltage. It would be possible to build an > LED replacement for an incandescent bulb that is dimmable. > Well if you have a resistor in series with the LED, set for 12 volts giving it around 30ma, which is typical bright current for LED, then if the pot on the dash reduces the voltage across them, guess what happens to the current. :-) -- - Jane Galt
From: Jane Galt on 8 May 2010 01:35 "Daniel who wants to know" <me(a)here.edu> wrote : > "Jeff Strickland" <crwlrjeff(a)yahoo.com> wrote in message > news:hs2cc7$sne$1(a)news.eternal-september.org... >>> >>> Not true. You dim an LED by reducing the current, while an >>> incandescent bulb is dimmed by reducing the voltage. It would be >>> possible to build an LED replacement for an incandescent bulb that is >>> dimmable. >> >> >> I did not know that. I thought an LED had two speeds, on and off. >> >> >> >> >> >> >> > > Incandescent and LED can both also be dimmed via PWM. > > The problem with LEDs is that the lumens/watt is similar to a CFL so > they don't draw enough current some times. Some cars have a simple wire > wound power rheostat for the dash light dimmer while some newer ones are > PWM. If your car is the latter LEDs should be fine, if it is the former > they probably wouldn't dim much at all because the current draw is too > little. In this image of a pull knob headlight switch the rheostat is > the white ceramic doughnut in the middle around the shaft. > http://www.the-jeep-guy.com/ELECTRICAL%20ACCESSORIES%20HEADLIGHT%20SWITCH > %205451098%20and%205450558.jpg > > The current draw problem also comes up when trying to replace exterior > lights with LEDs on cars with bulb-out sensors. A classic example of > this is rapidly blinking turn signals. > > Rube? Rube Goldberg? Seriously, it aint that complicated. LOL -- - Jane Galt
From: Jeff Strickland on 8 May 2010 11:51 "Daniel who wants to know" <me(a)here.edu> wrote in message news:hs2kpb$lvp$1(a)news.eternal-september.org... > "Jeff Strickland" <crwlrjeff(a)yahoo.com> wrote in message > news:hs2cc7$sne$1(a)news.eternal-september.org... >>> >>> Not true. You dim an LED by reducing the current, while an incandescent >>> bulb is dimmed by reducing the voltage. It would be possible to build an >>> LED replacement for an incandescent bulb that is dimmable. >> >> >> I did not know that. I thought an LED had two speeds, on and off. >> >> >> >> >> >> >> > > Incandescent and LED can both also be dimmed via PWM. > > The problem with LEDs is that the lumens/watt is similar to a CFL so they > don't draw enough current some times. Some cars have a simple wire wound > power rheostat for the dash light dimmer while some newer ones are PWM. > If your car is the latter LEDs should be fine, if it is the former they > probably wouldn't dim much at all because the current draw is too little. > In this image of a pull knob headlight switch the rheostat is the white > ceramic doughnut in the middle around the shaft. > http://www.the-jeep-guy.com/ELECTRICAL%20ACCESSORIES%20HEADLIGHT%20SWITCH%205451098%20and%205450558.jpg > > The current draw problem also comes up when trying to replace exterior > lights with LEDs on cars with bulb-out sensors. A classic example of this > is rapidly blinking turn signals. > I guess that's more like what I meant to say in the first place. LEDs and light bulbs are dimmed in different ways, and you can't simply put an LED into a light bulb socket and expect the dimmer to work. To be honest, and I'm nothing if not painfully honest, I have always been exposed to LEDs that were not in dimmable applications, and my electronics training from the mid-'70s is that LEDs do not dim. Just because they did not dim, does not mean that they cannot dim, I suppose. My exposure to them has always been in applications where it is not desirable that they be dimmable. When I said they can't be dimmed, I thought it was a true statement. On a side note, I have several LED flashlights, and I do not like the light specrum that they produce. Something about it is wrong to me. I must be insane because I keep buying them in the hopes that the next one will be different than all of the others. It never is.
From: Sharx35 on 8 May 2010 15:18 "Jeff Strickland" <crwlrjeff(a)yahoo.com> wrote in message news:hs41b1$pct$1(a)news.eternal-september.org... > > "Daniel who wants to know" <me(a)here.edu> wrote in message > news:hs2kpb$lvp$1(a)news.eternal-september.org... >> "Jeff Strickland" <crwlrjeff(a)yahoo.com> wrote in message >> news:hs2cc7$sne$1(a)news.eternal-september.org... >>>> >>>> Not true. You dim an LED by reducing the current, while an incandescent >>>> bulb is dimmed by reducing the voltage. It would be possible to build >>>> an LED replacement for an incandescent bulb that is dimmable. >>> >>> >>> I did not know that. I thought an LED had two speeds, on and off. >>> >>> >>> >>> >>> >>> >>> >> >> Incandescent and LED can both also be dimmed via PWM. >> >> The problem with LEDs is that the lumens/watt is similar to a CFL so they >> don't draw enough current some times. Some cars have a simple wire wound >> power rheostat for the dash light dimmer while some newer ones are PWM. >> If your car is the latter LEDs should be fine, if it is the former they >> probably wouldn't dim much at all because the current draw is too little. >> In this image of a pull knob headlight switch the rheostat is the white >> ceramic doughnut in the middle around the shaft. >> http://www.the-jeep-guy.com/ELECTRICAL%20ACCESSORIES%20HEADLIGHT%20SWITCH%205451098%20and%205450558.jpg >> >> The current draw problem also comes up when trying to replace exterior >> lights with LEDs on cars with bulb-out sensors. A classic example of >> this is rapidly blinking turn signals. >> > > I guess that's more like what I meant to say in the first place. LEDs and > light bulbs are dimmed in different ways, and you can't simply put an LED > into a light bulb socket and expect the dimmer to work. > > To be honest, and I'm nothing if not painfully honest, I have always been > exposed to LEDs that were not in dimmable applications, and my electronics > training from the mid-'70s is that LEDs do not dim. Just because they did > not dim, does not mean that they cannot dim, I suppose. My exposure to > them has always been in applications where it is not desirable that they > be dimmable. > > When I said they can't be dimmed, I thought it was a true statement. > > On a side note, I have several LED flashlights, and I do not like the > light specrum that they produce. Something about it is wrong to me. I must > be insane because I keep buying them in the hopes that the next one will > be different than all of the others. It never is. > Hmmm, Jeff, some DO define insanity as doing the same thing over and over, expecting different results. Guy by the name of Bill W.?? > > > >
From: Hachiroku ハチロク on 8 May 2010 16:25 On Sat, 08 May 2010 08:51:40 -0700, Jeff Strickland wrote: > > "Daniel who wants to know" <me(a)here.edu> wrote in message > news:hs2kpb$lvp$1(a)news.eternal-september.org... >> "Jeff Strickland" <crwlrjeff(a)yahoo.com> wrote in message >> news:hs2cc7$sne$1(a)news.eternal-september.org... >>>> >>>> Not true. You dim an LED by reducing the current, while an >>>> incandescent bulb is dimmed by reducing the voltage. It would be >>>> possible to build an LED replacement for an incandescent bulb that is >>>> dimmable. >>> >>> >>> I did not know that. I thought an LED had two speeds, on and off. >>> >>> >>> >>> >>> >>> >>> >>> >> Incandescent and LED can both also be dimmed via PWM. >> >> The problem with LEDs is that the lumens/watt is similar to a CFL so >> they don't draw enough current some times. Some cars have a simple wire >> wound power rheostat for the dash light dimmer while some newer ones are >> PWM. If your car is the latter LEDs should be fine, if it is the former >> they probably wouldn't dim much at all because the current draw is too >> little. In this image of a pull knob headlight switch the rheostat is >> the white ceramic doughnut in the middle around the shaft. >> http://www.the-jeep-guy.com/ELECTRICAL%20ACCESSORIES%20HEADLIGHT%20SWITCH%205451098%20and%205450558.jpg >> >> The current draw problem also comes up when trying to replace exterior >> lights with LEDs on cars with bulb-out sensors. A classic example of >> this is rapidly blinking turn signals. >> >> > I guess that's more like what I meant to say in the first place. LEDs and > light bulbs are dimmed in different ways, and you can't simply put an LED > into a light bulb socket and expect the dimmer to work. > > To be honest, and I'm nothing if not painfully honest, I have always been > exposed to LEDs that were not in dimmable applications, and my electronics > training from the mid-'70s is that LEDs do not dim. Just because they did > not dim, does not mean that they cannot dim, I suppose. My exposure to > them has always been in applications where it is not desirable that they > be dimmable. > > When I said they can't be dimmed, I thought it was a true statement. > > On a side note, I have several LED flashlights, and I do not like the > light specrum that they produce. Something about it is wrong to me. I must > be insane because I keep buying them in the hopes that the next one will > be different than all of the others. It never is. I love 'em! Not only do they have a nice bright, white light, the ones you get at the dollar store are cheap housings for "custom" electronic ciggies...
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