The headlights for the robot and the light control
driven with a digital I/O of the Low Level Supervisor
If you are not Italian, the white rings used to build the headlight holder could appear a little bit odd. They are sold as spare parts for a very important machinery.
Piling up some of them fixed with glue you have a very solid, flexible and waterproof support that perfectly fits the lamp size.
The control circuit is a very simple one: a transistor, big enough to support the 4-500mA current needed, a couple of polarizing resistors and the connectors.