System description:
With this system you have a constant reduction of the lamp luminous flux and, through a "presence relevation" by an IR sensor (100° angle detection), you have the maximum luminous flux for a fixed time.
The electronic circuit, with 12V nominal voltage, has the function of charge regulator with PWM technology.
The PV lamp programming can be set through micro switches for 3/6/8/10 hours per night or complete light sensor.