General:
The brightness I would verlgeichen with a GU10 halogen lamp between 25-30W.
In this case, however the light is scattered more strongly than most of the other lamps, so that they need less, as long as no extremely-lighting needs.
In my case, rich 3 lamps in the 35m² room just so, to play board games such as reasonable. 1-2 more but would not hurt.
The power consumption is, according to my measurements at 10,1W for 3 lamps. Although I sometimes go out of 1W inaccuracy, so the between consumption is within the specified scope.
"Warm White" is a matter of opinion:
Although I've seen much more cool lighting with LEDs, but as hot, I would not call it; it's just white.
Most likely, the light can compare with the medium Energieparlampen good, but it has advantages:
The LEDs are on at once and do not have time to warm up.
They are not as sensitive to fast on and off.
No strong toxins in the materials as many bulbs.
Disadvantages:
I have seen only at LEDs from 20 up really warm light. For example, the Bauhaus can they indeed see the Verleich - the most beautiful for me / warmest light came from a 25-LED.
CONCLUSION:
The best replacement for an energy saving lamp.
But really warm LEDs are still too expensive.
