I want to share here some findings about LED bulbs. Since moving and trying them out in my new flat, I noticed I cant handle any at all, they create the same tension around my eyes as new displays. Times have moved on since we first started here and I bought an affordable flicker meter - https://www.ledclusive.de/en/light-master-g3-748
It is not perfect, but the professional ones cost 1500 Euro or more. It measures amount of light, RA (color rendition), color temperature and flicker. I have found some interesting meterings with it I want to share.
First a LED bulb in a cafe that flickers even on phone camera (very good RA might be possibly an interference from outside light, but maybe its just very good ra bulb), the flicker is very stroboscopic:
Now LED that completely baffles me, as it has a traditional bulb pattern of flicker:
Now LED that has completely different pattern, but is also from IKEA:
Phillips recently admitted that LEDs cause issues and claim that they are trying to solve it - https://www.usa.lighting.philips.com/consumer/led-lights/eyecomfort
However, even the new ones for me dont work and I still feel nauseated when spending time under them. I think they nicely outline all the possible issues these might have. I think RA could be cause of issues as well, since low color reproduction means more strain on the eyes.
Theres also the issue that the flicker from the supposedly flicker free LEDs could be happening only between 90%-100% brightness as opposed to old bulbs. This would mean that technically the bulb is not going completely dark, but still oscillates between max and lower brightness with a stroboscopic effect.
I will keep measuring LEDs, but I am really baffled by the flicker pattern of that one IKEA bulb, I have never seen it on any LED ever, only on old school incandescent bulbs. There is a chance that if the flicker is not stroboscopic, but like that of old bulbs, these LEDs could be harmless (but seeing the list phillips made, I doubt that would be the only reason). I have to test this with daily usage first. Maybe there is some DC driver that softens the curve, maybe someone could explain?