That makes it much clearer, thanks. In other words, type A are the ones which don't have a current limiter and rely on the ballast for current limiting, while type B does. Depending on the rated current and voltage, a capacitor or resistive dropper would probably be suitable, but once again you need to post that information.
The cupper/iron ballast is nothing more than a coil. You don't know what the coil does in serial with the tube.
It could for instance drop the voltage with 20V or so, in that case they would have fitted less leds in the serial led string.
That is why I say, buy one type B and compare it:
- pcb equal ?
- components missing , different or additional components ?
- are the amount of leds equal ?
- is the Vf of the leds equal ?
that kind of things. Ofcourse you can just put it on a DC supply with current regulation and see with what voltage/current it reaches its nominal power.