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What is PWM ?

Q: Is turning an LED on and off bad for it? What’s “PWM”?

Ans: No. LEDs are semiconductors, which are quite happy with transitioning between an “on” and an “off” state. In fact, most LED flashlights provide extra output levels by flickering the LED at a faster rate than the human eye can usually detect. When the output is not filtered and smoothed out, the flicker can be seen when the light…