LED's
LED's
I want to investigate using LED's as an actual light source e.g. for a traffic light - Considering light output vs dissipated power, what are the best LED's to use ? An example of actual mcd vs watts would be helpful. Thanx in anticipation
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- Dave Dixon
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Re: LED's
Will,
Here's a site that has some info on various
voltage/wattage LED Traffic Signal Lights.
I hope this helps.
Ledtronics Traffic Signal Lights (LED)
Dave
Here's a site that has some info on various
voltage/wattage LED Traffic Signal Lights.
I hope this helps.
Ledtronics Traffic Signal Lights (LED)
Dave
- Chris Smith
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- Location: Bieber Ca.
Re: LED's
SuperBright Leds .com
Re: LED's
The US Department Of Energy has this information:<p>http://www.osti.gov/energycitations/pro ... i_id=55520<p>The above document is a bit old and comments that Green LEDs do not meet current standards. That was true back in 1994 when the document was written. Since then green LEDs have been developed that can be used in traffic lights. In fact Portland Oregon installed LEDs in their Red and Green traffic lights.<p>http://www.urbanicity.org/FullDoc.asp?ID=428<p>(NOTE: I believe that there might have been a "less" left out of the forth paragraph. See the OUTAGESCHEDULES link in the tower light section below.)<p>Not only are the normal stop lights being replaced with LEDs tower lights beacons are being made with LEDs.<p>http://www.tower-pro.net/Articles/LED_B ... eacons.htm<p>
And then there is this site. (Note how it says that the LED tower light uses 10% of the energy of the incandescent light.)<p>
http://outageschedules.beradio.com/ar/r ... _lighting/
And then there is this site. (Note how it says that the LED tower light uses 10% of the energy of the incandescent light.)<p>
http://outageschedules.beradio.com/ar/r ... _lighting/
No trees were harmed in the creation of this message. But billions of electrons, photons, and electromagnetic waves were terribly inconvenienced!
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Re: LED's
I dunno why they'd use LEDs for tower lights (except maybe for the always-on variety) rather than the current xenon white or red lens covered variety that can punch through a lot more darkness and fog.<p>I haven't seen any new traffic lights going in that aren't the LED variety in our area, and I live in Podunk, Missouri.<p>I don't know why the green has always been a problem for traffic lights. They insist that the "green" be shifted toward the blue so that color-blind folks can tell the difference between red and green. Seems to me that the fact that red is always on the top (except for demented cities that run their traffic lights in a horizontal direction) should take care of that situation. Besides, if the traffic in front of you is going from left-to-right or vice-versa as opposed to the same direction as you're going, it should be an indicator that the light is probably red. <p>Now, if you look at railroad signal lights, when they're green, they're GREEN. No blue in them at all. They don't hire color-blind engineers.<p>Dean
Dean Huster, Electronics Curmudgeon
Contributing Editor emeritus, "Q & A", of the former "Poptronics" magazine (formerly "Popular Electronics" and "Electronics Now" magazines).
R.I.P.
Contributing Editor emeritus, "Q & A", of the former "Poptronics" magazine (formerly "Popular Electronics" and "Electronics Now" magazines).
R.I.P.
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