The v4 that you have can measure only light sources that opple makes, they said that not me. The meter can measure more then 10khz flicker dont kn why your sjows flickering sky.

The sky does not flicker with the frequency of 9846Hz.

Which SteamDeck (old or new) is better for the eye? Let's check Deck LCD. Set the brightness to 50%

The screen is very pleasant for the eyes. After two hours, the eyes do not hurt. Recently released Deck OLED. There is a desire to buy. Let's check the Deck OLED for flicker. Set the brightness to 100%

Valve seems to have forgotten to add DC Dimming mode. After turning on FullPWM mode, it did not get better.

If you're still thinking which SteamDeck do you want to buy? Choose to opt for Deck LCD (my advice).

If your OPPLE v4 can read up to 9846Hz. then you shoud return it for a refund. The engineer answered that question on the https://budgetlightforum.com/t/opple-light-master-4-discussion-thread-new-2023-model/217940/874

"the minimum sampling time span for flicker is 11µs, according to Nyquist sampling theory, the maximal frequency is around 1000000 / 22, about 45K Hz."

So the output should be 45K Hz , not 9846Hz.

Besides OPPLE V4 is not sold anywhere except china, it's too much unstable to be sold in Europe. Don't know about US.

The answer from programmer / engineer Steve is not promising on the future of opple v4.

"idea from one of the employee of the Japanese’s firm verified, seems does not work.
I don’t know why those coefficients are constants, is it applicable to a wide range of CCTs? I doubt it."

"I think it is not we don’t care about other lights, it’s just we prioritize our lights first. we encountered problem as I said before, there is no smooth transition when one of the LM3 team member left us, and then I was not involved in LM development at all, so I have no knowledge of the transition process.
then the magic number listed in below graph emerged when I started to proceed to this development stage, those magic numbers are for LM3 which used as7262, but for LM4 we use as7341 for those magic numbers need to be recalculated, and I have no idea of how those numbers are generated. How can I do, please tell me."

Calling color constant "magic numbers", not knowing how colors are calculated.

Old team no longer is working on v3 and not on v4.

Upper management not understanding what product they are making for what market, they want to make it read their own light sources only. WFT? read about that in thread link i posted.

    Sunspark You are right to buy Deck OLED that flicker, a waste of money to the wind.

      smilem That does sound pretty crazy. Sounds like it was a small company that didn't document things and then they lost their subject matter expert.

        The LCD steam deck bothered me. I think it dithers ?

        Not all OLED screens are bad (as on SteamDeck). The eyes do not get tired of good OLED screens. Let's take the Lenovo Tab P11 Pro 2 Gen (OLED) as an example. Set the brightness to 10%

        For the 120Hz screen from PWM 55% of my eyes do not get tired. Most likely "eye safe" (as on the Poco F5). The frequency of DC Dimming / FullPWM is twice as high (than on Deck OLED). On Modulation depth 93% ignore, the frequency is too high for the Light Master. For those who do not like Mediatek, there is a model on SnapDragon 870 (they have the same screens).Helped RomanV82 with the review, thank you.

        Please pardon my ignorance. In this topic, it seems to be suggested that higher refresh rates on these phone displays cause more rapid flickering and therefore more strain. I had the impression that (at least with PWM) higher frequencies are less perceptible to the eyes and therefore less likely to cause strain. I have never heard of reducing framerate for better comfort, but indeed the opposite.

        Am I mixing up factors which are separate things?

          macsforme Low-frequency PWM hurts the eyes, high-frequency PWM causes migraine. On monitors, hybrid (dual PWM), when the eyes and head hurt. Flicker Free certificate does not mean that pixels will not flicker due to dithering/cheap 6bit + FRC panel.

            macsforme I had the impression that (at least with PWM) higher frequencies are less perceptible to the eyes and therefore less likely to cause strain.

            Generally speaking, I believe your statement is correct. Faster is generally better. For most people, most of the time.

              macsforme higher the refresh rate seems to be more comfortable for me. Also I'm pretty sure higher the refresh rate the more it could mitigate dithering/FRC? (Not 100% just seems like from what I've seen/read)

                Ninkear N15 Pro laptop on FullHD IPS-like panel CSOT SNF601BS1-1 (6bit+FRC)

                The Chinese have not heard of the Flicker Free certificate. The screen flickers even at 100% brightness. On the Poco GT X4 phone the screen flickers at a frequency of 50000Hz (painful to watch). On Ninkear N15 Pro the flickering is “normal”. You can ignore the Modulation depth value. Light Master counts incorrectly at frequencies above 10000Hz. Just look at the curve graph.

                Even if your eyes do not see flicker, this does not mean that there is no flicker. High frequency flickering is a common cause of migraines. At 50% brightness I don’t feel any problems with my eyes. This is understandable, because there is no flickering. Pulsations for IPS panels are also normal. At low brightness, the screen begins to flicker again.

                And flickering again. The truth does not 200Hz, as it was a couple of years ago on all AMD Ryzen laptops. Uncle Liao learns to make laptops good. The flicker for Light Master is too high (out of range). Modulation depth does not display correctly.

                4 days later

                what is the maximum flickering frequency that this device can detect? and according to your experience with this device: do you advice to use it?

                thank you

                9 days later

                Let's look at the lamps. The first will be Xiaomi Mijia Charging Table Lamp 5W (MJTD03YL).

                That's right, the lamp flickers with a frequency of 14000Hz. When the brightness decreases (in read mode), the pulsations increase.

                The second will be Xiaomi Yeelight LED Screen Light Bar Pro 10W (YLTD003).

                At low brightness, the lamp flickers at 1000Hz frequency.

                At high brightness, it is safe for the eyes.

                9 days later

                Here's the Redmi Note 13 Pro Plus 5G with AMOLED 1920Hz screen. Set to 120Hz mode (forced).

                Uncle Liao didn't cheat, it's a very good screen! Honest 1920Hz at low brightness.

                Modern laptops/monitors flicker even with a Flicker Free certificate. Why does TÜV Rheinland think flickering is more 20000Hz safe for the eyes? Take two laptops for example: Maibenben M545 for $500 and Maibenben X639 for $2000. And both flicker! Even at 100% brightness.

                My friend bought a drawing tablet. Blackview MEGA 1 (IPS / 120Hz). At 100% brightness, the tablet owner does not see flickering. The new AMOLED screens also flicker at 120Hz (screen refresh rate). This is a new "eye protection" technology.

                When the brightness decreases to 50%, the eyes do not hurt. I watched a couple of YouTube videos.

                Below 50%, the brightness of the PWM may be too high, especially for sensitive eyes.

                A friend has a Poco X4 GT phone flickering at 50000Hz. He also does not see flicker.

                  AlanSmith A lot of people can't see the flicker.

                  if watched telephone 10 min per day

                    dev