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

submitted 4 days ago by Ghostalmedia to c/videos

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[–] [email protected] 32 points 3 days ago (3 children)

This isn't what Christmas looks like. It's what a vape shop looks like. Or, worse, a gaming PC.

😆

My only gripe with the LED ones is that they always seem to have a high-frequency flicker which gives me a headache. Other people have told me they don't notice it, but I do. I wanted to replace the clear incandescent ones with LED but couldn't deal with the flicker.

[–] Brokkr 13 points 3 days ago* (last edited 3 days 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 3 days 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 3 days 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 3 days ago

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

[–] [email protected] 8 points 3 days ago

But capacitors are so expensive, it's like a whole 10¢ extra to filter it out so it doesn't flicker!

[–] [email protected] 6 points 3 days ago (2 children)

I have 1,000% light perception, I notice the flicker on almost every LED I've ever seen.

[–] [email protected] 3 points 3 days ago

I worked with a guy who had the opposite. He couldn't tell how flickery his screen was.

[–] [email protected] 1 points 3 days ago

My parents’ new house has all 60hz LED lights and I can’t stand being in there