Many lights use PWM to lower their output. But not very many of us have oscilloscopes, so it's not easy for us to determine the duty cycle of the PWM. I just realized that you can take a ballpark guess at the duty cycle by looking at raindrops passing through your light's beam. For example:
At 10% duty cycle, the "trail" of the raindrop looks like this:
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At 50% duty cycle, the raindrop looks like this:
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I noticed this with my Dry light, which has a floody beam. Not sure how well you'd see the raindrop trails with a throwy light.