To control the brightness of LED lights using PWM with a 35V, 0.35A DC input signal, a suitable PWM driver circuit is necessary to safely modulate the voltage without exposing the LEDs to high peaks. The existing driver circuit provides a constant current output, which complicates direct PWM application. Users are advised to consider using ready-made PWM modules or designing a circuit that incorporates a timing pulse generator and a power switching output stage. It's crucial to ensure that the PWM circuit is compatible with the type of power supply used, as switching power supplies may cause instability if not handled properly. For those interested in building their own circuits, further guidance is available upon request.