As a german i know what it means 
But i think its there cause there are to many factors with transformers and dimmers.
I have a 12 volt halogen electronic transformer that is dim able with "reverse phase control dimmer" and
"phase control dimmer". But here the dimmer is in front of the transformer and its AC.
I was thinking DC and PWM the whole time - maybe there is another way.
I mean if i feed less volt to the LED its darker.
Maybe AC instead of DC...
Edit:
Just found this: Non dimmable Led bulbs working with a standard dimmer - YouTube
So i need to do more research and use other words in google.
Was looking the whole time for PWM stuff.