Works for me only with 1 halogen spotlight and 3 LED

Transformer is now fitted. As in the ceiling light was little space I have sawed off 4 mm. In the light 4 halogen lamps were replaced W. All lamps with 20 LED spotlights and dimmed by dark, everything is fine. From 50% brightness flickers everything - not good. So I have 1 Halogen spotlight 20 W and 3 LED spotlights each with 3 W (dimmable!) Used. Now flicker the lights only at about 90% brightness. That does not matter, because 90% brightness are still brighter than earlier with the 4 x 20 W halogen lamps. If just dimmed just so bright that nothing flickers.
The problem, of course the interplay dimmer - are transformer. I have used a Kopp phase dimmer. It says: 20-375 W. So he needs 20 W minimum load. With 2 x 4 x 3 W LED spotlight I thought, yes more, 20 Watt. Apparently works of dimmers so but not (but why dimmed in dark and not in hell?). Now is indeed no longer saved as much energy (2 x 29 W instead of 2 x 12 W), but I can use the dimmer, transformer and LED spotlights.