For fluorescent, I saw some 1980s GE F20s in a display case at the Bryce Canyon Visitor Center and some of the 1960s louvers and troffers at my school. For streetlighting in service, I've seen a 1959 GE M-400 that got removed a few years ago and one that is still in service in a different place!

@suzukir122 No, no  I’m to young to drive a Porsche! He is still a good dad!

Ford Focus, ok ok, could be worse! Depends what colour for me, I’d quite like one in Orange!

I’ve mostly seen it on early Cree models. No other brand of screw in LED seems to go purple. Several parking lot LED lights seem to go purple at the same rate as the Autobahn street light.

https://www.lighting-gallery.net/index.php?topic=18703.0

It seems some older low quality lamps do this, but not nearly as often as street lamps do it seems

It does not exist physically yet - the web page contains just a computer visualisation with some of the lights.
I expect it completed within a couple of months and close-ups of real lanterns will be posted to the gallery.

Conventional home use led lamps don't go purple.

I have seen some 6500k filament led lamps shifting to purple at the DIY store near me. But this is only a faint effect, with the lamps already having reached their specified life span. The 2700k ones don't do it, and it's also only 2 out of around 40 lamps on display.

I know this is a widespread failure mode with street lights. I’ve seen some older Cree bulbs go purple (bulbs were all seen in public and all the ones I’ve seen were the first generation models), but on this site I’ve been seeing posts about the 4-flows also doing it.

I haven’t had any LED bulb go purple from my experience. Most of the purple lights I see are LED street lights or parking lot lights. I’m wondering if you yourself have ever had one of your household LED bulbs turn purple. Do they all go purple if one does like the street lights do? I know if one street light goes purple if the others are part of the same batch those go purple too.

I have an EOL 15W daylight halophosphate CFL in my father home. Despite lasting very long, it considerably dimmed out, due to phosphor degradation.

@LightsoftheWest: This is because when the lamp is old, the sodium distribution is rarely maintained, so sodium migration can occur.

There is not much technical reason why a CFL can not be made the same color as the linear fluorescents, but the main difference is the target market and consequently the use case and engineering optimization targets.

CFLs were targeted as incandescent replacenments for homes, so targeted very dense lumen packages (small size for the light output) and lower overal light flux (around 1000 lm and below per lamp), strong push for low unity sale price but with less strict requirements for efficacy.
Linear fluorescents were targeted for commercial market, so there the total cost of light became the driving force, so efficacy and long life/high reliability were the prime driving forces, as those form the majority of the total cost of the light. Then most applications were less strict about the color quality.
So the design target were rather large, high efficiency lumen packages (like F36T8/F32T8 with their 3000lm per lamp ballpark), with phosphor mixes barely meeting the CRI limits but boosting the lumens as high as possible (therefore the stronger green components), often barely reaching the 80 CRI (and not speaking about questionable quality super-low-cost makers).
All that beside the color rating category could be equal.

Yes, this difference is not absolute, but definitely driving the design of the mainstream products for the given market.