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Technology Connections: LED Christmas lights which don't hurt the eyes: it finally happened! (www.youtube.com)

submitted 1 week ago by Ghostalmedia to c/videos

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[–] Brokkr 13 points 1 week ago* (last edited 1 week ago) (2 children)

It is either a ~~30~~ 60 or ~~60~~ 120 Hz flicker, depending on how they built the electronics. It is ~~30~~ 60 Hz if they didn't include an inverter and ~~60~~ 120 Hz if they did.

Without an inverter, it will be off for 50% of the time. With an inverter, it will always be on, but sometimes dim.

With better electronics, it will be steady on, but that's not common in christmas lights.

[–] 9point6 8 points 1 week ago

Not strictly always true, if the lights have any kind of dimming capability (like many of the ones with automated patterns) you'll likely be dealing with PWM which means the time spent lit can vary significantly

[–] [email protected] 4 points 1 week ago (1 children)

Wouldn’t that be 60 Hz without a rectifier, and 120 Hz with one? If the voltage crosses zero twice per cycle, but goes negative only once.

[–] Brokkr 4 points 1 week ago

Yep, you're right. Had the 2 on the wrong side. Fixing.