Wow. The difference in flicker is insane between these three bulbs I had lying around (LED, CFL, Incandescent). This is at 1/6th speed. Your brain does not like the crap LEDs.

Our screens flicker like crazy. I developed a "superpower" after a bad concussion a few years ago & could see the flicker. Just like your slow video! Couldn't tolerate screens for over a year. Now use BENQ monitors & limit screen time. Incandescents only & many outdoor breaks.

Very interesting. Glad to hear you’ve found something that works. Those concussion symptoms can be so odd.

Sure can. Became a whole field of research for me. Which hurt my brain LOL. So much misinfo out there. Lots of culling, but discovered many helpful techniques and a couple great brain supplements.

That’s why we Incandescent

Amen

Isn't it better to just buy flicker free leds than incandescents?

Pros: cheaper electricity, flicker even less than incandescents (e.g. Sylvania Truwave) Cons: most will disrupt sleep more than incandescents due to emission spectrum

@sherkhantx Solution: dont sleep with the lights on

@sherkhantx Most people don’t sleep with them on. And unfortunately, that wouldn’t solve the issue anyway.

I always feel stressed under LEDs and this is 100% the reason why Even when the colour is warm

Yes, it’s a big part of it. Shame they’re putting them everywhere!

They don’t even sell incandescent bulbs in most shops anymore I assume you can buy them online though, yes?

Yes, but it depends where you’re located. In the US, you can get them on Amazon or some at Home Depot

Here in Europe?

It’s harder, but I’ve heard found a clever way of getting around the ban, maybe also check (Netherlands) or (UK)

Thanks for the links btw

My pleasure

Good quality LED bulbs don't flicker.

True. Unfortunately most of them out there are not good quality.

No. Many are. Buy Philips for a start.

Autists can see and feel that 1st one. I’m not even on the spectrum, but I can not be around LEDs.

Yeah for sure, I can see and feel the first, they’re awful

Imagine the kids in schools and people in Hospitals all day. and they wonder why you have “episodes”

For real, *definitely* doesn’t help

Can someone explain the charts under the bulbs. I get they’re use of the color spectrum of the bulb, but what’s it supposed to mean? What’s the chart of the sun?

The charts show relative intensity at different wavelengths (colors) of light. I’ve attached a chart which is close to midday sun from @daylightco’s blog Perceived spectrum emitted by sun changes a lot throughout the day (a lot more red and infrared in the morning/evening, more UV and blue at midday) Basically the blues are a lot more stimulating (typically see at midday), and there are other effects of different colors across the spectrum, so it can be helpful to see a light’s emission spectrum when deciding what bulb you want to be exposed to all day Lmk if any of that wasn’t clear

@daylightco Makes sense. In terms of effects on the human body, esp re:LEDs, is it spectrum or flicker that have the adverse effects?

@daylightco Both. Flicker = eye strain, headaches, fatigue, worsens migraines in some. High blue at night = circadian disruption, melatonin suppression. There are also known benefits to red/infrared you’d miss out on if you’re never exposed to those.

We can’t even find incandescent bulbs anymore….

There are places you can order them online, depending on where you’re located

Going to test some, but IIRC they have a lot less flicker than some of the crappy LED bulbs. If they do flicker much, it’s most likely to happen on dimmer settings. If you set your phone to record slow motion at 240fps, you should be able to tell.

@BasedPainter I tried on my Philips Hue. I can’t see any flicker at 240fps I’m in UK (50hz if that makes any difference?) 🤔

@BasedPainter Cool. I've looked into the Hue a little more. They're a lot less prone to flicker (around 1000hz vs. 100-120hz for crappy bulbs like the one I tested in the video)

Hate, loathe LED’s!

Agreed. If you ever need incandescents, check out our website. We have them.

What about cell, laptop screens? They are backlit by leds. 🤔

Totally. Some BenQ monitors flicker a lot less, so they can be a good alternative to reduce eye strain. Or, for a flicker & blue free tablet computer, check out @daylightco

Since when do LEDs even have red in them. That’s surprisingly more balanced than I thought spectrum wise. Incandescents still superior

Yes, it is not quite what you’d expect. Generally these bulbs contain all blue LEDs, coated with phosphors to change the emission spectrum.

@Dolphins19845 How does the Purple street lights even happen? Which phosphor fails?

@Dolphins19845 The phosphor coating is a mix of phosphors. The purple you see is the result of the blue LED light (its true color) blending with the remnants of the phosphor layer that is damaged or has started coming off.

What about Philips EyeComfort LED bulbs?

Definitely less flicker. Not sure about emission spectrum.

Is the advantage of less power usage really meaningful, if you add up electrical usage for lighting in the home, it's may be one of the lowest when compared to motors, compressors, electric stoves and dryers... ?

LED seems like a design problem. Add component to hold charge to stabilize flicker. We have developed the crystals for all spectrum with LED, just need to bring the price point down which my understanding is on the way. Seems we have the engineering part solved, just need scale.

Will local electricians be able to swap out modern can lights with incandescent housing?

Should be able to if they can get their hands on them still

David Daines, what about the flickering incandescents some comments mention? What’s their flicker rate compared to good LED’s? Maybe nobody’s studied flicker of incandescents powered by AC current, because they’re too busy hating on LED’s?

Less flicker than incandescents in truly high-quality LED bulbs, but many (myself included) prefer the incandescent emission spectrum (very little blue, good amount of red & NIR)

LED lights damage the retina.

Interesting. They mainly focused on pure white, a few different blues, and a little green-exposing rats for 6-72h. Would be cool to see with commercial LED bulbs.

Myopia pandemic across kids - while not the main factor heard that flicker might contribute quiet a bit

Can you do the Philips hue next? 🙏🏻

Sure, I’ll get my hands on one

Making a high quality LED, almost indistinguishable from incandescent is quite cheap and easy. Stop hating LEDs. Start hating the companies that intentionally make overpriced, trash LEDs

@M3yamotoMusashi idc if we pay more, i can’t live like that with epilepsy. We need regular bulbaa

@nick_plaid We should go back to DC for our lighting circuits, no flickering 🤷🏼‍♂️

@grok can you tell what would be flicker rate in lighted Diya and candles, as some spiritual organisation keeps them in their premises and also concentrate around them?

Thankyou for posting this. Where can one purchase incandescent lights please?

Depends where you’re located. In the US, Amazon, Home Depot, and Lowe’s all have them

@amazingyearT1 @grok where can one buy the in Sweden or Europe? Are they even allowed?

In the EU, including Sweden, general incandescent bulbs have been phased out since 2012 for energy efficiency reasons, with bans on production and import. Specialty or exempt types (e.g., for appliances) may still be found. You can buy them online from international sites like Ubuy or eBay, which ship to Sweden, but check customs for any import restrictions. Prices start around 100-200 SEK for packs.

How do you test this yourself? You take a video and slow it down to 1/6 speed, how? I want to try with my own lights.

Yes, but it needs to be really high FPS. You can see a lot with 240fps slow motion on iPhone, for example.

TIL that flicker can have health effects even if it is too fast too see

Cheap and shitty bulb @ 240fps on the iPhone.

@Grok,人体への悪影響を検証して

@grok is this true?

@Phaggass

CFLs give off UV

the office really is the killer.

@grok how much does phillips hue flicker in comparison