I bought Opple Light Master, what's next?

AlanSmith

How do I check that Light Master works?

1. Download Light Master Pro via Play Market

2. Connect Opple Light Master via bluetooth

3. Light Master needs GPS and Internet to work.

4. Lift the Light Master above your head and measure,

- Does the sky flicker? And compare the results with mine.

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

That means Light Master can't see the flicker | Or the brightness (screen) is too high.

AlanSmith

Let's check the Meizu 15 Lite (IPS) phone for flickering | Set the brightness to 10%

The presence of PWM is proven as you can see. The phone is "almost safe" (if turned off). Modulation depth 99.5% indicates measurement error (outside the sensor flicker range). Most likely some kind of cunning "eye protection".

AlanSmith

Let's check the Vivo iQOO Z8 (IPS) phone for flickering | Set the brightness to 75%

The graph is just noises. The brightness is high. Light Master does not see flicker.

It is necessary to lower the brightness. Set brightness to 50%

Previously, screens from Sharp had a PWM of < 1% over the entire brightness range. Set brightness to 20%

It's hard to say if the phone is safe? Most likely at low brightness "there will be problems". Light Master cannot count the modulation depth at a frequency higher than 10000Hz. We only look at the curve graph. The flicker is visible. Only an oscilloscope can say "more accurately." The owner complained that the illumination of the phone (like welding) hurts his eyes.

AlanSmith

Let's check the Xiaomi Redmi Note 9 (IPS) phone for flickering | Set the brightness to 50%

We see the frequency of 9846Hz, which means the screen does not flicker. Or the brightness is too high and Light Master simply cannot detect flickering. They usually look at the curve graph (which I don't have).

Set the brightness to 0% -> Modulation depth / PWM 16% (average result)

AlanSmith

"MUCH EASIER" to see if the AMOLED screen is flickering? Xiaomi 12X | Set the brightness to 50%

It looks like someone forgot to turn DC Dimming on. I even felt a bit sorry for the owners of Samsung.

AlanSmith

Let's check the OnePlus 12 (Amoled) phone for flickering | Set the brightness to 100%

Why screen doesn't work at 2160Hz? Uncle Liao, get my money back!

AlanSmith

Why do my eyes hurt from a laptop? The review says that the screen does not flicker. What to do? | Let's check the panel. In a review by LG LP125WF4, AIDA64 shows BOE NV125FHM-N62. Set the brightness to 100%

Just flickering the screen (at 1000Hz). Panels change quite often.

Do not trust reviews, check the panel yourself (before buying).

GregAtkinson

I'm glad that you had some fun with this. I feel like everyone on this site should at least start with an Opple Light Master and move up to more sophisticated equipment if needed. $50 to understand your eyestrain better seems like a small price to pay.

AlanSmith

Let's check iPhone X (OLED) for flicker | Set the brightness to 50%

Well, who said iPhones are safe for the eyes? Checkmate gentlemen.

Lauda89

AlanSmith My iphone X with IOS 14 is totaly different:
https://ledstrain.org/d/2577-im-testing-as-many-macbooks-as-possible-here-are-the-results/75
What ios are you using? Are you sure that the panel is original?

Anyway, i have zero symptoms with the iphone X even with a modulation deep of 99%!

Sunspark

This is not a bad flicker though. Look at the graph. The dips don't keep going down, there is a floor that is stable.

AlanSmith

Vividblu99 Throughout all of 2023, the Honor 70 Lite was the least problematic handset I've tried, and has provided the most comfort. It's followed closely by the Honor X8A. I've found both of these comfortable when using them at a fixed 60hz refresh rate only.

Good phones from Honor are sold as hot cakes. You are pleased to look at 60Hz, because at 90Hz, modulation (PWM) increases by 1.5 times. At 120Hz, "eye fatigue" is multiplied by two. Let's check out the new "cheap" Honor X8b (which is great to look at). Set the brightness to 50%

The promised 3240Hz were stolen! Again. Huawei, it's not funny anymore! When will you add FullPWM (like Vivo)?

You just need to set the brightness to 25% (so that Huawei magic turns into a pumpkin) | PWM 16%

With a decrease in brightness, you can see "eye protection" at the 184Hz frequency.

It can be seen that the people who work at Huawei are not fools, but they don’t know how to make phones.

dzwdev

this is the device you are using: https://www.aliexpress.com/item/1005003302809897.html ?

i hope that you test iphone 6 and iphone 6s and realme c11 and Xiaomi Mi A2 if you can

thank you

AlanSmith

dzwdev Of course I can if you send them to me.

AlanSmith

Rataplan

Poco X3 NFC - not good, could only use it for a few minutes.
Poco X3 Pro - same as NFC, slightly better colors but that was it.

So what are we waiting for, Let's check Poco X3 NFC (IPS) for flicker | Set the brightness to 50%

PWM is above normal. The eyes will get tired. Other phones have about 5-6%. Set the brightness to 20%

- Who sees the flicker? Me too. It was enough for 20 minutes. My LG G6 also flicker at low brightness. But from his MiniLED screen, my eyes do not hurt.

AlanSmith

Lauda89 The last Iphone I had was XR. The phone doesn't flicker at all. Did not include it for a long time. Iphone X is not mine. It's a friend's phone. He only sent me pictures. I don't know about the screen. Given that the phone is seven years old (screen may not be original). Modulation depth 99.5% indicates measurement error (outside the sensor flicker range). PWM 99.5% is only possible on Samsung phones. These "demons" like to make a person suffer.

AlanSmith

Lauda89 Are you sure that the panel is original?

Here's a photo after replacing the screen for the iPhone 12. The owner bought screen at Aliexpress. After being replaced with IPS (from China), his eyes stopped hurting.

Do not look at the Modulation depth reading (the value is not correct). Most likely, Light Master just shows "eye protection" at a high screen refresh rate. The curve graph of the original IPhone X and 12 screen must be the same. Only an oscilloscope can see in more detail.

You can compare it with the original screen from IPhone 11 (IPS). The difference is just huge (in favor of the original).

AlanSmith

People say that the Xiaomi POCO F5 doesn't hurt your eyes. Because it has a 1920Hz screen. How can you prove it? Let's check POCO F5 (Amoled) for flicker | Set the brightness to 100%

DC Dimming is on. What already? And I don't feel any flickering. Set the brightness to 75%

Xiaomi deceives the brain with flickering (in multiples of 60). Set the brightness to 50%

Do not pay attention to Modulation depth. The screen is very pleasant. Just flickering is outside the Light Master measurement range. A little fatigue appears an hour later.

nikomanuel96

Thanks for this, this post is very useful!

You are using the opple 3 or the 4? You have realme phones to test? i cant find an opple lm here where i live, i am curious to see what results could have the realme narzo 30 5g (wich i am using now without problems) or the realme 9 pro (wich almost everyone here likes with few exceptions)

sorry bad english.

AlanSmith

nikomanuel96 You don't need a Light Master to see the pulsation. It is enough to have a second phone. Just take a photo of the screen (with an shutter speed of 1/8000). Let's find "eye-safe brightness" on the OnePlus 9R (Amoled) | pictures taken by Ilemar, thank you.

Flickering on the screen are stripes. The more stripes, the more flickering. When the IPS screen looks clean.

As you can see, up to 50% of the brightness "the eyes do not hurt." PWM 20% for 120Hz screen is normal.

When the brightness drops to 30%, red tears will come from the eyes. It's time for DC Dimming to turn on

You can compare two photos. The eye strain has halved. When turning on 60Hz, it is safer four times.

The PWM limit is 30%. At brightness zero "eye protection". Why is DC Dimming disabled by default?

AlanSmith

Why do your eyes hurt more at 144Hz than at 60Hz? Using the Motorola Edge 30 Pro (OLED) as an example. Let's look at the graph of the curve.

As you can see, at 144Hz the screen flickers more often. This means that the modulation depth (PWM) at 144Hz is higher. And the eyes will also get twice as tired (at the same brightness).