LED Lights and Garage Door Opener???
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From: JosephKK on 20 Apr 2010 00:35 On Thu, 15 Apr 2010 18:09:05 -0400, "Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote: > >Joel Koltner wrote: >> >> "Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote in message >> news:4BC750B9.C003B50D(a)earthlink.net... >> > They didn't. The LED lamps are retrofitted. They did the red first, >> > in my area. >> >> Hmm... I wonder why red? Spends the most time on? If one color is going to >> fail, presumably people will just stop anyway, so why not make it the red one >> that'll fail anyway? > > > My guess was that they were replacing more red lamps, and started the >conversion to LED as they failed. Depends a bit on the locale, mature city, county and state level systems were on a regular, say 6 month, complete relamping schedule. The maintenance crew took the old lamps home where lasted for decades. LED signal modules however have a 5 or more year replacement schedule, think of what that might mean to say San Francisco, New York or Chicago.
From: JosephKK on 20 Apr 2010 00:37 On Thu, 15 Apr 2010 18:11:22 -0500, "krw(a)att.bizzzzzzzzzzzz" <krw(a)att.bizzzzzzzzzzzz> wrote: >On Thu, 15 Apr 2010 13:45:29 -0400, "Michael A. Terrell" ><mike.terrell(a)earthlink.net> wrote: > >> >>PovTruffe wrote: >>> >>> Just one thought: why did not they design traffic lights with RGB LEDs ? >>> They should be much cheaper with a single lamp. >>> However we are all so used to 3 lamp traffic lights... >> >> >> They didn't. The LED lamps are retrofitted. They did the red first, >>in my area. > >Red lights were often higher power and burned out faster. LEDs made more >sense, initially, for the red (and were cheaper). Nope. Same lamp in all signal sections (unless of different diameter). MRO spares item control issues.
From: Charlie E. on 20 Apr 2010 01:14 On Mon, 19 Apr 2010 21:29:17 -0700, "JosephKK"<quiettechblue(a)yahoo.com> wrote: >On Thu, 15 Apr 2010 11:11:17 -0700, Charlie E. <edmondson(a)ieee.org> >wrote: > >>On Thu, 15 Apr 2010 10:57:03 -0700, "Joel Koltner" >><zapwireDASHgroups(a)yahoo.com> wrote: >> >>>"Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote in message >>>news:4BC750B9.C003B50D(a)earthlink.net... >>>> They didn't. The LED lamps are retrofitted. They did the red first, >>>> in my area. >>> >>>Hmm... I wonder why red? Spends the most time on? If one color is going to >>>fail, presumably people will just stop anyway, so why not make it the red one >>>that'll fail anyway? >> >>First, red LEDs are the cheapest, and easiest to drive, so they were >>the first to come out. Also, the red filter means a lot of heat insde >>for the old incandescents. >> >>Next came green. which was a little harder to drive, and didn't last >>as long initially. After those problems were solved, they were in >>use. >> >>The yellows came last, mainly because the yellow incandescent is on >>with so little duty cycle that they last forever anyway! >> >>Charlie > >No. The yellow and green indications were normally replaced together, >the issue being maintenance cycle. Very much from the required lane >closures and attendant traffic control issues. Different cities probably did it differently. I know that Irvine didn't change out the yellows till years after the green and red. Charlie
From: mrjb1929 on 19 Apr 2010 09:52 Thanks everyone for the comments and suggestions. This problem did get resolved and the Ultra Bright LED's that I was using in my front yard were causing RF signal's to block the Garage Door Opener Remote from working properly. I swapped them to the back yard and used some other LED bulbs. Funny though... These were purchased via eBay but came from a US Distributor and not overseas, so these were the LAST ones that I suspected as causing the problem. Thanks again, Jerome --------------------------------------- Posted through http://www.Electronics-Related.com
From: Joel Koltner on 20 Apr 2010 12:57
"JosephKK" <quiettechblue(a)yahoo.com> wrote in message news:5fbqs5t2d6e9bp71lr6a3gag52l9cs4bfr(a)4ax.com... > The > maintenance crew took the old lamps home where lasted for decades. ....because they're really 130V (or thereabouts), right? > LED signal modules however have a 5 or more year replacement schedule, > think of what that might mean to say San Francisco, New York or Chicago. Do you happen to know what the incadescence bulb replacement schedule is? I recall reading once it's astonishingly short, to make the likelihood of a bulb outage almost nil. (Although it seems like having, e.g., two filaments -- and detection of when one or the other went out to call for expedited replacement -- might have been cheaper?) ---Joel |