Some examples of light bulbs that I never knew that existed include some decorative non-integrated 4 pin CFL lamps used in the Japanese market. Some of these decorative non-integrated CFL lamps have a bullet shaped diffuser and others have a spherical shaped diffuser. They have power ratings available in 9w for use on F10T8 preheat ballasts and electronic ballasts and 13w for use on F15T8 preheat ballasts and electronic ballasts. However, the 9w lamps are only available as a 3000K warm white lamp with a spherical diffuser while the 13w lamps are available with either a bullet shaped diffuser or a spherical shaped diffuser with either 3000K or 5000K CCTs available. Interestingly, they can also fit directly into G10q lampholders designed for either circline lamps or 2D lamps. The bullet shape lamps are known as “FTL” lamps while the spherical shaped lamps are known as “FGL” lamps.
Here is a Japanese 9w 3000K spherical non-integrated CFL lamp:
https://www.jauce.com/rakuten/item/luminous81023:10004281/Here are the Japanese 13w spherical non-integrated CFL lamps:
3000K version:
https://www.jauce.com/auction/q10367844645000K version:
https://www.jauce.com/auction/h1033953058Here are the Japanese 13w bullet shaped non-integrated CFL lamps:
3000K version:
https://www.jauce.com/rakuten/item/brian:10000384/5000K version:
https://www.jauce.com/rakuten/item/tokumaru2019:10034232/Note that $1 USD is approximately ¥100 JPY.
I learned about the existence of these strange CFL lamps after I was looking for some Japanese CFL lamps to add to my collection.
I find these CFL lamps quite strange and unusual because most decorative CFL lamps are self ballasted lamps while most non-integrated CFL lamps do not use decorative diffusers unlike these Japanese lamps.