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On Thu, 06 Jan 2005 12:49:36 -0600, Cecil Moore
wrote: Zero probability that you simply misunderstood my original question? More to the point, did you? Aside from its sucker spin, then why ask? Did you know it is now being used on automobiles? LEDs have been in general illumination for quite a few years - even for headlights. If they are new to you, you can't afford them. |
Richard Clark wrote:
LEDs have been in general illumination for quite a few years - even for headlights. I know that. The question was and is: WHEN DID THEY START TIME MULTIPLEXING AUTOMOBILE TAILLIGHTS? I am asking for information and it's perfectly OK if you don't know. Constant current LEDs have been in use for years. But it's just over the last couple of months that I have noticed the pulse-width modulation on some automobile taillights. I suspect it's only one or two manufacturers so far. -- 73, Cecil http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
On Thu, 06 Jan 2005 13:30:37 -0600, Cecil Moore
wrote: WHEN DID THEY START TIME MULTIPLEXING AUTOMOBILE TAILLIGHTS? Who is THEY? This still sounds like a sucker posting. Anyway, 5 years ago. Why don't you try rec.philosophy.automotive for this topic? |
Richard Clark wrote:
Cecil Moore wrote: WHEN DID THEY START TIME MULTIPLEXING AUTOMOBILE TAILLIGHTS? Who is THEY? Shirley, you jest. Anyway, 5 years ago. Doubt it. I would have noticed long before now. -- 73, Cecil http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
Bill Turner wrote: How interesting. I wonder if they are pulse width modulated to compensate for day/night? What other reason could there be? That might be it. It would be a convenient and efficient way of adjusting brightness. They also might be compensating for voltage and temperature by changing the pulse width. Roy Lewallen, W7EL |
On Thu, 06 Jan 2005 14:30:24 -0600, Cecil Moore wrote:
Richard Clark wrote: Cecil Moore wrote: WHEN DID THEY START TIME MULTIPLEXING AUTOMOBILE TAILLIGHTS? Who is THEY? Shirley, you jest. Anyway, 5 years ago. Doubt it. I would have noticed long before now. Do you mean that the subliminal CW messages have had no effect on you? :-) Jonesy -- | Marvin L Jones | jonz | W3DHJ | linux | Gunnison, Colorado | @ | Jonesy | OS/2 __ | 7,703' -- 2,345m | config.com | DM68mn SK |
On 6 Jan 2005 22:37:03 GMT, Allodoxaphobia
wrote: Doubt it. I would have noticed long before now. Do you mean that the subliminal CW messages have had no effect on you? :-) Hi Jonesy, Like I figured, another sucker posting. Cadillac was doing this for its 2000 model: " The 2000 Cadillac DeVille was the first vehicle to go into production that utilizes HB LEDs for its rear combination lamps (RCLs) as well as for its CHMSL. Many of the benefits here are intangible-examples are the "jewel like" appearance of the RCL and the ability to provide the tail light function with a particular shape associated with the DeVille line. There are several tangible benefits that can be measured, however, including reduced electrical load, reduced mass, warranty savings, and mass production quality improvements. Although the Cadillac DeVille is the only production vehicle with a complete LED rear combination lamp assembly, several other recent car makes and models have incorporated LEDs into various signal functions. These are primarily limited production luxury cars, such as the Mercedes S-Class, BMW 5-Series, and Nissan Gloria." On the Lincoln Town Car: "light-emitting diode array on the rear of this vehicle in a research project at California Partners for Advanced Transit and Highways takes data from the wheels and brakes and sends a signal to following cars indicating the acceleration and velocity of the vehicle." which, of course, fulfills your anticipation of subliminal CW messages. ;-) As the old adage goes "if you have to ask, you can't afford it." rec.philosophy.automotive may provide more details - this is clearly beyond the pale of electromagnetic anything from anywhere. 73's Richard Clark, KB7QHC |
That might be it. It would be a convenient and efficient way of
adjusting brightness. They also might be compensating for voltage and temperature by changing the pulse width. Hi Roy, You can do all the above with a regular light bulb. I think the reason they use multiple LED's is to reduce the mean time between failures. If a regular bulb fails, you are dark. If half of the LED's fail you still have light. They generally have 20 plus LED's. in the stuff I have seen. Also, LED's tend to last than bulbs (I think) 73 Gary N4AST |
Richard Clark wrote:
Like I figured, another sucker posting. Cadillac was doing this for its 2000 model: " The 2000 Cadillac DeVille was the first vehicle to go into production that utilizes HB LEDs for its rear combination lamps (RCLs) as well as for its CHMSL. Many of the benefits here are intangible-examples are the "jewel like" appearance of the RCL and the ability to provide the tail light function with a particular shape associated with the DeVille line. There are several tangible benefits that can be measured, however, including reduced electrical load, reduced mass, warranty savings, and mass production quality improvements. Although the Cadillac DeVille is the only production vehicle with a complete LED rear combination lamp assembly, several other recent car makes and models have incorporated LEDs into various signal functions. These are primarily limited production luxury cars, such as the Mercedes S-Class, BMW 5-Series, and Nissan Gloria." Uhhhhhh Richard, like I figured, you have no clue. The subject is NOT LEDs used in automobiles. The subject is ***TIME-MULTIPLEXING*** of LEDs used in automobiles and there is absolutely no mention of time-multiplexing of the LEDs in your above posting, i.e. it is irrelevant to my question. On the Lincoln Town Car: "light-emitting diode array on the rear of this vehicle in a research project at California Partners for Advanced Transit and Highways takes data from the wheels and brakes and sends a signal to following cars indicating the acceleration and velocity of the vehicle." Again, absolutely no mention of any time-multiplexing of the LED currents so your posting is completely irrelevant to my original question which continues to be: WHEN DID AUTO MANUFACTURERS START MULTIPLEXING THEIR AUTOMOBILE TAILLIGHTS. I suspect it was on the 2005 models and certainly not five years ago as you mistakenly assert. I first saw a time-multiplexed LED taillight on my 2004 Thanksgiving trip to Memphis. I simply do not believe your assertion that time-multiplexed taillights have been around for five years. The onus of proof is upon you and your above posting is certainly NOT proof of time-multiplexed LED taillights. -- 73, Cecil http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
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