To switch on the Transloetje, touch the base of the lamp, right above the grey box, this is the part with the arrow on it. The brightness of the Transloetje can be adjusted in three modes:
Start position; the Transloetje is switched off.
Touch the base once: the light burns with 15% brightness.
Touch the base twice: the light burns with 50% brightness.
Touch the base a third time: the light is burns with 100% brightness.
Touch the base for the fourth time and the Transloetje will turn off again.