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Street Lights turning Purple

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--- Quote from: Ranayna on December 05, 2022, 08:43:37 am ---LED streetlights are weird...
I don't mind them as much in a car, at least after they have lost a bit of their initial brightness. When new they can be annoying point sources :D
My town was switches from CCFL tubes to LED during the last two years. The older ones are noticeably dimmer already. Is this degradation linear? If so, i wonder how long they will last.

But as a pedestrian, especially if there are tree branches under the light, the shadows the LEDs cast are, well, weird. All shadows are multiplied, since each LED throws it's own shadow, and if the branches are moving in the wind, the effect on the ground can be almost nauseating.

--- End quote ---

I'm not sure what the depreciation curve for LEDs looks like but I bet the manufactures have it available. I know that with fluorescent and metal halide lamps they depreciate pretty rapidly during the first 100 hours and then settle into a long slow decline. When they hit 70% of rated lumens they are considered end of life. IIRC rated lumens is the value after the first 100 hours.

I've found that LED street lights vary widely, some of them are almost point sources and have a lot of glare, others are much nicer. I like the white light much better than orange HPS but I don't like it as well as mercury vapor.

I saw one in July of last year in my area of Fairfax County, Virginia, and until recently hadn't seen any more.  But in the past month or so, I've seen a few.  Perhaps my electric utility bought most of their lights late in the run of bad units, so the failures are just beginning, or maybe the bad batch comprises a small percentage of their fleet.  I'm certainly not seeing the clusters of failures like some other parts of the country are.


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