That is, there’s no fading required, so a static voltage with current limiting circuit would power the LED perfectly fine.. Is it to increase the already long life of the LED’s? Is it to reduce power consumption?
The same thing happens with DRL’s on a car, they’re fed a PWM signal rather than just static 12V from the car’s battery
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PWM has several advantages, two of them just off the top of my head being:
1. LED brightness can be regulated with a digital input, by invreasing the on/off ratio
2. Less/no heat dissipation required in the power supply as opposed to a current-limiting resistor
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