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.

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.

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

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.