How do I adjust the lightning of Add the Wally?

To turn Add the Wally on; tap the arm of the lamp. The clarity of the Add the Wally is changeable and has three modes:

Start position: Add the Wally is off.
Tap the arm 1 time : the light is lit with 33% brightness, 4,91 Lumen
Tap the arm 2 times: the light is lit with 66% brightness, 20,24 Lumen
Tap the arm 3 times: the light is lit with 100% brightness, 58,61 Lumen
Tap the arm 4 times: Add the Wally goes out again.