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#41
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A problem with LEDs
BOO!!! HISS!!!
-- Christopher A. Young Learn more about Jesus www.lds.org .. "HeyBub" wrote in message m... You would have to find the cast of "Under the Rainbow" and put them to work. Look, if the federal government can settle a "little people" lawsuit over discrimination in public housing by building an entire apartment house in Chicago and letting about a thousand midgets, dwarfs, leprechauns, elves, and pygmies live there at no cost, they ought to be able to recruit enough workers for a few crucial intersections. I've seen the apartment house. It's called the "Chicago Stay Free Mini-Pads." |
#43
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A problem with LEDs
On Thu, 17 Dec 2009 21:24:20 -0500, Art Todesco wrote:
I used to live in Bolingbrook, IL, a southwestern suburb of Chicago. All the traffic light are LED. I have seen them obscured when there is a wind blown wet snow. But, it usually doesn't last long, so I don't know how much an issue it really is. BTW, they also had UPSs on every traffic light, so power failures didn't affect the lights. I don't know how many hours the lights would keep working. Y'know, I think most of ours in town here in northern MN are incandescent still, but I've still seen them full of snow. I think all it takes is for there to be a little space open above the snow pile; the cold air gets in behind the pile and makes the heating effect from the bulbs irrelevant. What they perhaps need are separate heaters at the bottom of the shrouds, but I'm not sure how that could be (reliably and relatively maintainance-free) switched so that the heaters only ran when they needed to. Perhaps there's some way of detecting how much light from the bulb is being reflected back (due to snow build-up) and tripping the heater that way. cheers Jules |
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