When the light is on and you press your switch once, the light goes out. But if you press the switch twice quickly, the light dims. There are 4 different intensity levels. To return to the maximum intensity, you have to put the light on the minimum intensity level, press the switch twice and it returns to the maximum intensity. You don't need a dimmer or any special installation. The lamp can be installed in a standard way.
By pressing several times in a row the light changes its intensity and also switches from cool white to warm white. The lamp remembers the choice that has been made.