Important Note:
I have replaced the LED lamps in a system with "toroidal transformer". Which it does not itch, that he has to give wesenlich less power now. I also tentatively exchanged in a 5 Series Hi System with electronic transformer times 2 hellos to LED. This transformer begins to buzz on and off the built-in LED 3 flickers massively.
In plain English: toroidal transformer makes no funny business in Austauch Hello to LED - elektonischer transformer already.
The problem that hellos are indeed "change Stromer" and LED's stop "direct Stromer" does not itch at least for toroidal transformers.
Toroidal transformer: This thick round things. Electronic transformers usually thin and rectangular shape.
So, hope to have something helped.
PS .: I just again nen 10-pack of LEDs ordered. I've yet to replace 2 systems.