[LargoLasskhyfv]

I didn't say that, or did I? Anyways, indeed they are chains of tiny LEDs in series, and the substrate they are embedded in is treated somehow. As I understand it, that gives the embedded LEDs a "Nachleuchtzeit"/ after glow like in the CRTs of old TVs and computer screns, which can vary, as it did with that old screen stuff too. Then there is the spatial thing, as they are spread out in the filament, you can actually look at them without being "blinded". It's more like the light radiates from a volume, softer, not from one sharp point. Not that it would matter that much, who has naked bulbs? As a result of all that there is no https://en.wikipedia.org/wiki/Beat_(acoustics), no perceivable flickering at my power frequency of 50Hz. I think I'm sensitive to that, because the line/destination signs on public transportion do flicker for me when I and they both stand, not only when in motion.

Ah yes, the CRI. What can I say? I now have them everywhere, except the cellar. I prefer warm white, which they are. I can't see 'wrong' colors with them. Crosschecked that with a cassette of about 40 Faber-Castell color pencils right now, during my local morning twilight. Full spectrum.

Because "retro-fit" they fit in my old sockets. They just hit a sweet spot for me. I dim, or 'tune' them by using one to three circuits, the switches and my rooms are wired to allow for that.

Old, but not obsolete ;-)