How spiral compact fluorescent bulbs are formed - GIF

[PJs]

Yup, AFAIK, CFL is/was essentially a transitional technology (are there still remaining niche uses for it?). The light quality is too jarring for residential use, and its popularity was at least in part attributed to questionable enviro-friendly promotional tactics known as Greenwashing.

Interestingly Jon, CFL's are still used in photo/video lighting because of the ability to dial in the color temperature with gas and coatings. My big umbrella and small spot lights are CFL and they are almost perfect on in color temperature and last quite a while if you take care of letting them warm up and cool down before handling. My one pair of LED's I never use with out a screen or a decent filter. LED's are getting better and by now days, using filters for photo/video, but the affordable filters have some issues, imho. High end glass filters are good and will last a good while but not price friendly at all because of all the various colors & sizes needed for that kind of work. High end stuff is still using Gel's I believe.

Home LED's are being color/temp referenced (marketed) now and got some for the bathroom fixture a while back but again they are a bit jaring, off temp a fair amount and done with filter materials in the globe.

A little reference for color temp.

The three primary types of color temperature for light bulbs are: Soft White (2700K – 3000K), Bright White/Cool White (3500K – 4100K), and Daylight (5000K – 6500K). The higher the Degrees Kelvin, the whiter the color temperature.

Here is a Planckian Locus chart from wiki on color temps.

The CIE 1931 x,y chromaticity space, also showing the chromaticities of black-body light sources of various temperatures (Planckian locus), and lines of constant correlated color temperature.