The power I have measured once briefly:
0.4W in clock display without anything,
0.7W with radio on Volume 10,
1.5W with radio volume to 20 (max)
1.6W with lamp brightness to one of 20 (without radio),
2.0W with lamp brightness to 11 from 20,
4,0W with lamp brightness to 16 from 20,
6.5W with lamp brightness to 18 from 20,
8,0W with lamp brightness to 19 from 20,
10,0W with lamp brightness to 20 of 20th
And one more info for sensitive people: The separating colon between hours and minutes flashes at 1Hz clock.