this post was submitted on 03 Feb 2026
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That's not even close to reality.
Read the material linked or just google it yourself.
That's a bit incoherent.
Fwiw, I did read the article you linked. That's one of the articles I looked at originally.
I'm just saying its innapropriate to say its "not a filter" because the coating is doing more than partially filtering a wavelength of light; Its a categorical error.
The coating's primary engineering function is not a filter, so maybe its frustrating to hear it described as one but it is absolutely incorrect to say its not a filter because one of things its literally doing is filtering out a % of the blue light emitted by the diode.
A phospor absorbs the incoming light and then uses it as power for its own emission process, in a processes called "fluorescence" rather than "filtering". It's a very efficient process because almost all of the light coming in and absorbed by the fluorescent material ends up used to emit light.
A filter just cuts out (literally "filters out") things other than what it's supposed to let through. Filters just block stuff and thus cannot have on their output anything that's not present on their input. Further, filtering can be very inefficient because everything that the filter doesn't let through just ends up as waste heat.
Filtering doesn't make any sense for light emitted by a diode junction because that specific light emission process emits light of a single wavelength - it's a totally different process from incandescence and only emits photons whose energy exactly matches a specific quantum gap in that junction, hence all emitted photons have the exact same wavelength, thus there are no other wavelengths in the light emitted by the diode to filter out - thus if you filter out that specific wavelength, no light at all goes through the filter because there's nothing else there.
Calling a phospor a "filter" is like calling a system with a solar panel connected to a green LED a "filter" - sure, the spectrum of the light coming in is not the same as that of the light going out, but that's pretty much the only way the thing behaves the same as a filter - it does not share any of the other characteristics of a filter.
Anybody with a Physics or Engineering background will react the same as me when somebody describes a fluorescent material in front of a light source as "a filter" because per the scientific and engineering definitions "fluorescence" is not at all the same as "filtering".
Whatever source you learned information about LED lights from, it's really bad and shows no domain expertise, which is probably why you ended up with some things right in your explanations and others horribly wrong. If I was to guess, I would say that you "learned" it from AI, as getting the general stuff mostly right and the domain expertise details incredibly wrong is a common problem of AI.