The electronics in this design harvest the energy from a (small) three phase windmill. This energy is used to supply nine 1W (350mA) LEDs.
A wind speed measurement is performed. A microcontroller compares the speed of the windmill with pre-programmed wind speed thresholds.
Depending on which threshold is met, a certain amount of LED drivers is turned on to power the according LEDs with the energy available.
The result is a visual feedback of wind speed, like a VU meter for volume in an audio amplifier.
In case of too much wind energy (more than 10W), a protection circuit flushes the energy that is not used.