Originally, the versions with 12V, 20 Watt were stocked, which are however often failed and a significantly higher power consumption have (18.44 watts per socket). In my case, that then all in all about 150 watts less.
Often this is the color temperature and light output are discussed and I have allowed myself a photo to attach that the color temperature and the difference is supposed to represent the conventional bulbs.
As you can see in my case the difference in light output marginal (LEDs are slightly lighter). Even when the color temperature there is in my case a (small) difference (LEDs are a bit "cooler").
I run the LEDs by the way still the old transformer and everything works smoothly and dims.
SUPPLEMENT: To all who say it flickers. Please make sure that you have a matching transformer. For me it worked in a room with an existing transformer (for halogen bulbs).
In another I had the problem with flickering and with too few brightness.
Only with a suitable transformer (approximately 12, -), we went.