After knowing that 4 pin PL-S CFL lamps with 2G7 and 2GX7 bases and 4 pin PL-C CFL lamps rated for 13w operation with G24Q1 bases, 18w operation with G24Q2 bases, and 26w operation with G24Q3 bases are often said to only be compatible with electronic ballasts, I am beginning to wonder if these CFL lamps have a different gas filling or different electrodes than 2 pin PL-S and PL-C CFL lamps that use integral glowbottles. In that case, will a 2 pin PL-C CFL lamp on its proper magnetic ballast last longer than a same wattage 4 pin PL-C CFL lamp running on the same magnetic ballasts assuming that an external starter is connected across 2 of the pins?

In addition, will G23 and GX23 PL-S CFL lamps running on their proper magnetic ballasts last longer than same wattage 2G7 and 2GX7 PL-S CFL lamps running on the same magnetic ballasts assuming that an external starter is connected across 2 of the pins?

If that is the case, should magnetic ballasts cause premature blackening of these 4 pin CFL lamps?

In my experience, I have not observed any problems with running 2G7 PL-S CFL lamps on magnetic preheat ballasts so far when I wired an external FS5 starter across the 2 inner pins.

I think it's possible. Because on the packaging of the Philips PL-C tube in China is written "2-pin tube using magnetic ballast; 4-pin tube using electronic ballast"

According to an Osram Catalog, I seem to be getting this information about the operation of 4 pin PL-C and PL-S lamps on magnetic ballasts:

"3.2.3 Operation of
OSRAM DULUX®
S/E, D/E and T/E
with external
starter and CCG


OSRAM DULUX ® S, D and T lamps (with two-pin bases) have been designed specifi-
cally for operation with conventional control gear. Integrated in their bases is a special-
ly developed glow starter that has been adapted to the particular requirements of
these compact fluorescent lamps. OSRAM DULUX® S/E, D/E and T/E with four-pin
bases are intended for operation with electronic control gear, and hence without a star-
ter. Generally, it is possible to operate OSRAM DULUX® S/E, D/E and T/E lamps (13 W,
18 W and 26 W only) with conventional control gear and an external starter under nor-
mal operating conditions. However, there is no starter currently available on the market
that has been designed specifically for this purpose (see also 6.3).
In this mode, considerable limitations can therefore be expected, such as greatly
reduced lamp life with lamp glass blackening on the electrode side and longer
ignition times. For this reason, this mode of operation is not recommended or
supported by OSRAM."

In that case, should I expect the 2 pin PL-S and PL-C lamps to last longer than same wattage 4 pin PL-S and PL-C lamps on magnetic ballasts assuming external starters are used with such lamps?

In addition, I am also beginning to wonder why PL-S and PL-C lamps use specialized starters and not conventional starters.

Here is the link to the Osram catalog where I sourced this information from:

https://www.farnell.com/datasheets/301616.pdf