I have a hand-cranked LED flashlight, and when I shake it, the light projected onto the ground appears as individual light spots (light balls) rather than a continuous light strip. Can someone explain the principle behind this phenomenon? Is it related to the way the light is emitted or the motion of the flashlight?
I think, that the brightness of the LED is controlled via pulse width modulation (PWM). So dimming the light is achived by turning the LED very fast on and off. Now if you move the led then you would get a continous line if the LED would be contiously ON. But due to the PWM you will get dedicated spots.
