visible duty cycle

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peteybaby
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Joined: 01/06/2011 - 01:17
Posts: 544
Location: North Vancouver, Canada
visible duty cycle

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.

gcbryan
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Last seen: 2 months 3 weeks ago
Joined: 05/07/2010 - 20:42
Posts: 2541
Location: Seattle,WA

Nice observation. Raindrops we have! I'll have to try that.