I think our natural tendency toward round numbers is to blame. I believe if 3500 were a round number, and the next increments were 2500 or 4500 there would never have been any doubt.
since we have read that the bulbs have a flicker problem in USA, and maukka reports they also have a flicker problem in Finland
where in the world are you located?
you did what kind of test?
did you look through a camera, was there any banding?
did you test for flicker, some other way?
Im from canada, I just leave the light on for an hour or two at night before I sleep, no camera just my eyes
Visible brightness fluctuations are rarely an issue in the US. Trust me, we would know about it if it was a widespread issue (we’ve sold tens of thousands of bulbs).
We are testing with ~15 people now across Europe to see if it is repeatable. We are only asking them to observe if there is a visible change.
By the way, the camera banding test is not a very good indication of flicker. My phone camera (Google Pixel 3) will pick up even 2% flicker and make it look like we’re at a disco. Other flagship phones appear to have the same “issue.”
Here are some numbers from the original footage of my video.
First I exported one frame every second:
ffmpeg -i 00000.MTS -vf fps=1,scale=640:480 frames/%05d.png
Then I took the average brightness of each exported frame:
for x in frames/*.png; do convert $x -colorspace gray -format "%[fx:100*mean]\n" info: >> log.csv; done
This is the result:
There are some fluctuations. Not sure if they correlate with the mains voltage, too lazy to OCR the text from the multimeter. 
Oh, this doesn’t tell us if there’s a flaw in my setup. But random noise looks different.
edit: I manually compared the brightness and the mains voltage and both correlate with each other more or less. I think this is very similar to the result from maukka.
Thanks for that test. It’s very helpful.
If I’m understanding the graph, the camera is picking up minor brightness fluctuations of around 1% (from a trough of ~52.7% to a peak of ~53.7%). You also notice some slight visual changes in the output just by observing. Is that correct?
I don’t think the absolute values of the scale mean anything (although it is in percent, but percent of what?). The changes are very hard to notice and I think it depends on the situation and the observer if it is noticed at all.
IMHO the point is that the Badtime Bedtime Bulb has a behavior that is not found in other bulbs.
OK, thanks for the clarification. And it may well be a “badtime” bulb in this instance!
Oops. :person_facepalming:
So today i received a bulb from Yeutterg, there were 4 people at home, we all tried to see visible flicker in different scenario (direct vs indirect, dark room vs a little bit of light) all of us failed to see any fluctuation in intensity or flicker, i’ll do some further testing tomorrow.
Is there any kind of typical household load i can put on my electrical system that is susceptible to induce voltage fluctuation ?
I also must say that the light produced is superb for a bedside table or such in my opinion, very soothing and high CRI compared to my 3000k osram led bulbs.
Big AC, fridge, anything with a big honkin’ motor that draws a lot of current on startup (compressor motor kicks in, etc.).
Circular saws and other power-tools are good for that, too.
And vacuum cleaners. They will pull some juice!
For the last days I have used the Bedtime Bulb in my bedroom as the only light and have observed visible output fluctuations several times.
Thanks for the pointer to https://www.ies.org/fires/melanopic-green-the-other-side-of-blue/
This is why we use amber LEDs as household lighting in the evening. The amber floodlights available appear to mostly use Luxeon Rebel emitters:
And at critical locations around the house, we have this sort of thing for don’t-step-on-the-pets perambulation at night:
https://www.mrbeams.com/amber-stand-anywhere-light
Thank you for confirming the Bedtime Bulb has the fluctuations that maukka reported.
His review of the Remez SunLike E14 LED bulb (3000K, CRI95) reports:
I would buy the Remez, not the Bedtime
What sort of fluctuations ? Is it a rare short dip and back to stable or is it lasting alternating changes ?
The only detectable fluctuation we manage to see is a short dip in intensity when our AC compressor turned on when a lot of other appliances where on also
Yes, it appears as a dip whenever there is a jump in the mains voltage. A sudden jump of 1 V is enough to be noticeable. In both directions. The brightness an the mains voltage seem to be proportional.
I suspect when this happened in our little extreme electrical load experiment that the voltage change might have been much greater than 1v since i’ve been told even the plasma TV went dark for moment when i was looking at the bedroom bulb.
Thanks for the feedback so far. We have two people who have noticed any kind of brightness change during normal operation. Six people have not noticed any change. We are still continuing the investigation.