Have you seen Purple/UV Street Lights around you?
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It's actually not something covert. It's a manufacturing quality problem wherein components fail and the units have to be replaced with better quality devices. However this purple light problem is real and is widespread in some communities.
If it hurts, the lamps may be putting out a lot of ultraviolet. Here's a test: have something that is fluorescent orange. If it appears bright orange at night under the lamp, that's a sure sign this is an LED lamp whose internal phosphor has failed and it lets dangerous UV from the diodes out. (UV causes fluorescent materials to glow and actually emit light.)
A white light LED works like this: the LED actually puts out ultraviolet at the core. The LED converts that to white light by having a phosphor coating around the emitter to do that, they operate just like a standard fluorescent tube light. In the street lights with a manufacturing defect, the coating degrades and lets purple and UV out. And that damages eyes.
This may be topnotch Chinese LED quality here, where they are shoddy just to save a penny.
If the light hurts your eyes at night, blueblocker glasses can stop the UV. They will look clear for ordinary light but they block UV wavelengths. Might be useful for a cop on night patrol.
I am a reef keeping nerd, and know the capabilities of UV especially from LED format. Trust me bruh.....those little diodes from ALL the way 10" feet above our heads is NOT enough UV to do shit. For instance the UV in a reef tank gets dilluted by the time it hits the sand bed in most 14" aquariums. The purple especially. Thbere is t-5 bulbs tho.....these flourescent bulbs and metal halides, used to put out mega fuck tons of UV. Especially the halides. Which WERE the old street lights lol. :D:D:D:D
This is especially concerning since you really can no longer purchase indecent lights. This older technology leaked into the infrared which we tolerate well. This new technology leaks into the toxic UV band
Household LEDs are of less concern because their power levels are far lower than street lights, hence home bulbs don't degrade to leak UV as fast. Street lights run so hot that they need heat sinks for the LED arrays. When they get really hot, over time it breaks down their phosphors. Home LED bulbs not so much, at least.
Humans can't see UV but your eyes can be damaged by it.
For LEDs putting out UV, we can also see nearby wavelengths which get pumped out too, so seeing purple in this LED case means there is some UV.
A conclusive test is when dyes that are daylight fluorescent are glowing in a light source, it is putting out UV. Another test is that many washing detergents have brighteners in them, and if your shirt glows a bit bluish under a purple streetlight, that is a sign the detergent residue is reacting to UV hence there IS UV.
You actually think damaged lights begin to emit UV light?
Give me one example of your absurd statement, please. One. Single. Example.
Please.
I actually have some respect for you, so I will not give a snarky reply. Here's my background and indeed, one example:
The guy is mostly correct on the cause, degradation of the phosphor (not phosphate though). But he's wrong in that the degradation doesn't turn the LED itself to UV - that is fixed forever by quantum mechanics factors. See #3 below.