The ends of fluorescent tubes with traditional EM ballasts flicker at 50/60 Hz because the filaments take turns being the cathode and anode based on the current polarity of AC, which is perceptible in peripheral vision. And some long tubes have waves on their arcs, causing travelling ripples of bright spots. But without a more advanced ballast, there’s just the phosphor smoothing the 100/120 Hz ripple, which is not very effective (and usually, yellow phosphor lasts longer than blue, resulting in color banding in video) but that’s not normally perceptible.

I never thought alcohol would make the brain work faster though, thanks for sharing!

Glare? That’s not a physical property of LED light but an effect of overly bright headlights enabled by LED and laser technology.

It’s not a part of the title but yes, “app” is the official descriptor now.

I oscillate between chaotic good and chaotic evil. Like the shower. You just witnessed a chaotic evil idea.

Poorly made LEDs actually flicker at 120Hz on 60Hz mains, see my other comment. And it’s more like a pet peeve, only below 60 Hz is actually headache-inducing. Unless it’s specific circumstances (I couldn’t stand a cheap 120Hz PWM RGB strip close to a gaming monitor because I’d see annoying “rainbows” as my eyes dash across the screen). More details in my other comments.

Yup. Except they flicker at double the mains frequency because they use both the positive and negative half-cycle thanks to a FULL BRIDGE RECTIFIER.

And see my other comment: it’s not unhealthy, just annoying. To be honest, I use trash-picked LED bulbs and repair them, and I don’t normally care to replace a poor smoothing capacitor. In rooms I spend much of my time, I make sure most bulbs in the fixture are low-flicker (it’s arbitrary but generally don’t get below 75%) for comfort. I’m not peculiar about light quality like CRI and matching color temperature unless it’s very obviously bad, although I do notice the circadian effects of cold white light. I do mark badly flickering bulbs though so I know not to put too many of them together unless it’s somewhere non-consequential like a cellar. I also hold my phone camera to any neutral-white E27s I salvage to find and mark true flicker-free ones because I use them while filming.

I would get headaches from watching PAL (50Hz) CRT TVs for a long time. 60Hz monitors were noticeably better, and 75 or more was good to endure all day. Modern screens don’t go blank between refreshes (except PWM-based AMOLED) so the refresh rate is mostly irrelevant unless you want to shave off a few milliseconds of latency for serious gaming (then it’s best to match the refresh, render FPS and video signal).

But as I’m walking down the street and move my eyes, I notice cheap lighting whose drivers don’t smooth the 100Hz ripple of rectified AC. Especially if they reach 0% brightness during the ripple. This applies to:

• sodium and mercury vapor lights in street lamps
• single-board (aka mains-voltage) LED modules in cheap, powerful reflectors
• any LED bulb or fixture with a constant-current driver whose mains smoothing capacitor is too small or has failed due to heat (however, some such as EMOS and Solight spherical 18W ones refuse to turn on if the capacitor gets too bad, making for an easy repair)
• any dimmable light powered from DC (like 12V and 24V non-addressable LED strips with those cheap flat remotes, or multi-mode flashlights) whose manufacturer was too cheap for a constant-current driver (fair enough) but could have very easily set a higher PWM frequency YET DIDN’T and therefore deserve a PWM shower.
  • This is especially annoying with RGB ones because the hue changes during the cycle, creating off-color fringes or even “rainbows” when moving my eyes. I can’t believe some people use things like that in/on/around their battlestation: this would totally distract me as my eyes dashed around the monitor while gaming.
• multiplexed displays, especially with low duty cycles (look up charlieplexing, chances are your powerbank or similar gadget uses that to minimize the pin count of its chip) - these are usually over 100 Hz though

So yeah, it’s not unhealthy, especially above 60 Hz. But it’s annoying for me to look around badly smoothed Christmas lights. And if they are of different phases (this is uncommon for Christmas lights (and even impossible in most American homes because they have 180° aka split-phase 240 V, not 120° 400 V) but always the case with multiplexed displays), I say a long rolling R to vibrate my face and see them wiggle.

You’re right: strange how they keep shoving things nobody wants in the name of their product - first “Office” became “Microsoft 365” (subscription-only), then “with Copilot” (opt-out upsell) and now the mandatory Copilot upsell.

The silver lining is, small and medium-sized companies are increasingly ditching the pricey offering for employees who don’t have document editing a major part of their duties, making them realize LibreOffice is now good enough for their personal needs.

A temperature knob could be added to control the pulse width. Get this shower to everyone who designed LED lighting with PWM frequency below 100 Hz.

Probably varies wildly by body part

Fair, I still use Office 2007 via Wine. Even the newest one has the killer features (unless it’s the awful web version) but your willingness to use it depends on how strong your aversion towards proprietary OSs and AI is

Microsoft 365 Copilot App

Oh, you’re right. Without “App” though, that slipped through because someone wrote “the Microsoft 365 Copilot app” (a string you’ll see in official MS texts) in title case.

That doesn’t exist. It’s Copilot 365 now so you’re not missing much.

This but with an acid and a base

Yes! And I’d much rather haz ICAN than ICANN. They are OK with numbers but their names department is run by a bunch of clowns.

• - “Can I uze a word plz?” - “Submit an application, we take them every 10+ years for $300K each and you’ll get a reply in 12-18 months”
• - “You’re deprecating .io? What about my domain?” - “Get fucked”

I’m referencing “ICANN haz .meow?”, a slogan by the .meow campain (Fully funded now!)

There’s colorful S-shaped emoji too (💲⚡) but I get why you want to avoid these symbols

I originally thought it was a kind of Sphinx riddle

Ich kann dir alles geben, was zum Thema zu lernen ist (es geht nicht um vieles). Die Frage kommt von mir (in der YT-Version werde ich aber nicht erwähnt) und es handelt sich um diese Tastatur: https://feddit.org/comment/9000852

Sie haben aber die Frage editiert, ohne mir Bescheid zu geben…

How about 3WES?

YouTube
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My ISP, O₂CZ (who collaborates with an Israeli cybersecurity company to “protect” (and spy on) everyone with default DNS settings) also blocks this one