[PCM2]

The biggest issues with colour balance with LBL settings usually comes from the green channel remaining relatively strong. Everything having a greenish or yellow tint, which is unsightly and sometimes too strong for your eyes to properly adjust to. BenQ’s LBL settings I particularly like as they tend to balance the green channel appropriately. They also offer good flexibility, allowing the user to easily select a slightly weaker setting if they’re finding the image ‘too warm’ even after allowing the eyes to adjust. Last but not least, they’re easy to adjust and switch between.

Certain models from other manufacturers also offer a good implementation in this respect as well, but they’re quite variable and you’d have to consider them on an individual model basis. I find Samsung’s ‘Warm2’ colour temperature setting works quite well, for example. And the ‘Paper’ mode on some Dell monitors is good, whereas on others it has an extreme yellow or green tint. The ‘5000K’ colour temperature setting on Philips models is also nicely balanced I find, although it again varies between models – and it’s often better balanced than their actual ‘Low Blue Mode’ settings. See for example the Philips 328P6VUBREB.

[vegetaleb]

If you want a good WB while having LBL, get a Benq. Mine has a so good WB that you won’t see a difference with a normal screen

[TVG]

vegetaleb, but your BenQ is EW2775ZH which is untypical case because of its LBL+. However, looks like I should really wait until recently announced Benq models for Mac become available. (Looking forward to reviews from PC Monitors.)

And let me ask something about existing software solutions. As we know, most of blue reducing utilities are also very balance-distorting. Are there any of them that do it as gently as BenQ monitors do? (Turnkey solution may be more convenient then manual configuration in the case of a monitor without good build-in LBL mode.)

[PCM2]

f.lux is quite flexible these days and it does tend to lower the green channel a fair bit as well as red. But I don’t feel the colour balance is as well-maintained (even with gentle adjustments) as BenQ’s LBL settings. I personally like to aim for a colour temperature of around 4000 – 4800K for LBL settings and I find this can be achieved with BenQ’s LBL settings whilst retaining much better overall balance (and shade variety) compared to f.lux.

[vegetaleb]

I got a Lenovo 23.8” X24 Thinkvision as a screen for my office at work, unfortunetely it doesn’t have any real menu, only brightness control!
So my choice to apply a blue light filter is either use Win10 Night light or Nvidia control panel, which option is better and how can I do it in Nvidia panel?
I can still push for a swap with a newer screen as this one was used for 2 years by another employee, so are either option good or should I ask for a newer screen?

[PCM2]

I’ve merged your thread with the existing one on the topic, it doesn’t really warrant a separate thread. Software-based and hardware based solutions are both discussed here and each has their merit.

In terms of effectiveness and minimising ‘upset’ to the image, it’s best to do this on the hardware level. On the monitor itself. But software-based methods, be it using Nvidia Control Panel, f.lux or Windows 10’s ‘Night Light’ setting can be very convenient and also quite effective in the actual blue light reduction. Moreso if combined with a relatively low screen brightness set. Obviously if there’s no OSD you only have the software-level solutions at your disposal.

The advantage of the ‘Night Light’ setting is really convenience. It works well and doesn’t require any specific thought or manual intervention. Reducing the blue colour channel and adjusting other channels as desired in Nvidia Control Panel offers more flexibility. You could go for more or less than the ‘Night Light’ setting and adjust the green channel and red channels to your liking as well. But I’d suggest trying the ‘Night Light’ setting first and see how you find it. It’s pretty convenient and for many users it would do the trick.

[vegetaleb]

I want to replace my BenQ monitor 1080p 27” with a 1440p 27” , I have found the Lenovo P27Q pretty good with an IPS panel and 8bit 99% sRGB, it has a single LBL option On/Off only compared to the 4 differents LBL modes of BenQ, I use the ”Office” one on the BenQ and it doesn’t alter too much the WB so I can view and edit my photos without fake colors, Lenovo claims they have now the TUV Eye comfort certification Direct access button for automatic image setup and brightness allows quick and easy monitor setup Compliance with ENERGY STAR 7.0 requirements Compliance with RoHS.
What do you think?
Will the Lenovo LBL be the same as BenQ with an acceptable WB or it will be a yellowish tint on whites?
BenQ here has either TN 4k monitors 28” or the very expensive SW2700, that’s why I am thinking Lenovo

[PCM2]

I’ve merged your thread with this one where there are existing discussions on the topic. I did this last time as well, please pay attention to my replies in future and don’t create very specific threads for individual monitors when this thread is an appropriate place to post.

I have no experience with the Lenovo or their Low Blue Light (LBL) settings, so it’s something you’d have to discover for yourself. And if you do, your feedback would be welcome.

[vegetaleb]

Thank you and sorry for not paying attention 😊
Can you reach the same level of LBL by tweakings things in the osd to match the BenQ “office” preset?
Or benq LBL modes are hardware based?
I really like how they use lbl while keeping the WB natural. I tried a P27q today, the lbl is better than the standard one on some LG that used to simply decrease blue and produce a pinkish WB, the WB is not as good as on the benq though, it’s slightly greenish so I wouldn’t say no if tweaking a bit can help.

[PCM2]

Yes, that should be possible with some careful adjustment including reduction of the green colour channel. All BenQ’s presets really do is offer factory-set adjustments to the colour channels which also include reduction in the green colour channel. It’s obviously nice to have easily accessible presets which are well-balanced like this, but manual adjustments on other models should achieve similar results.

[vegetaleb]

Thank you

[vegetaleb]

What about samsung’s LBL?
Specially on the S27R750Q

[PCM2]

It might be worth reading through this thread again, because I’ve already addressed Samsung’s implementation. Specifically with reference to their ‘Warm2’ setting. It offers good balance, I haven’t actually come across a Samsung model with a ‘Warm2’ setting that has an overly green cast to it. So I wouldn’t expect that issue on the S27R750Q.

[vegetaleb]

Hello
Sorry to bother you again.
I am not convinced about the Lenovo P27Q-10 as it’s not clear if it has flicker free, it’s a ”plain” 8bit panel and no review here, I am ready to pay more (250$ more actually) for a more confirmed and tested monitor, I have found the AORUS AD27QD in my country, it has all the good stuff like IPS 1440p 27” 8bit+frc and your review is pretty positive.
Now what about the LBL? You said it’s good in decreasing blue channel but it has either a strong green or red tint depending on the LBL mode, can you balance the WB in this case while keeping blue ligh low but a more natural white for photo editing (like on benq)?

[PCM2]

To be completely clear, if any monitor (including a BenQ model) has a highly effective LBL setting that doesn’t significantly reduce contrast, then the image will have a warm tint. That’s how they work, as covered in this thread and reviews – they reduce the blue channel significantly. Some of BenQ’s settings also reduce the red colour channel slightly to counteract this a bit. But reducing the red channel as well comes at the expense of contrast and saturation levels so large adjustments there are avoided. The stronger LBL settings on BenQ models most certainly reduce colour temperature.

This warm tint may or may not be obvious depending on the settings you were using just prior to activating the setting and your eyes will readily adjust to it in time. It doesn’t affect the image balance to the same extent as a strong green tint, which provides a cast and imbalance to the image that your eyes don’t fully adjust to. So the ‘Warm’ setting on the Gigabyte is actually quite decent, but if you feel the image appears too warm and you want to make your own manual adjustments then there’s nothing stopping you. As with any monitor that offers manual control of the colour channels.

[vegetaleb]

Thanks!

I just checked again the LBL of my friend Lenovo P27Q-10 at work, it’s indeed a bit toward the green , the annoying thing is that brightness is locked once LBL is activated! So in case you want to use your screen in a low light room brightness is not low enough, brightnes is locked at 30-40%. I also checked for flickering using my S10’s camera with minimum and maximum brightness, I couldn’t find flickering bars. So all in all , the Lenovo’s LBL is good enough for office work with day light but not for home.

[PCM2]

One of my contacts from Datacolor pointed me towards a neat website called f.luxometer. It includes measured spectral data for a range of screens (mainly from portable devices). It predicts the sort of short-term effects that the blue light emitted from a screen can have on the body, specifically with respect to melatonin production and the potential to disrupt sleep. It also demonstrates how different colour temperature calibrations (or activating f.lux), brightness levels and viewing distances can affect this. It helps highlight how effective Low Blue Light (LBL) settings combined with reduced brightness can be in reducing high energy blue light output (HEVL).

[jpetso]

On a different note, German monitor website prad.de recently posted an article titled “Study: Blue light affects neither eyes nor sleep” (original article in German). Not sure what to think about all of this, personally.

[PCM2]

Google translate links don’t work, but here’s the original article (users can translate on their own – Google Chrome is easiest). This is based on a single study from the German Ophthalmological Society that is very limited in scope. It is a study exclusively involving 18 – 24 year olds – and only 167 individuals at that. Some of whom used an iPhone with a blue light filter function activated and some without the filter activated. That’s a much smaller screen than a monitor, so exposure to blue light is relatively low in comparison. There has been a huge amount of highly focused research and far wider-reaching studies into the disruption of blue light on sleep. The link between blue light and your circadian rhythms (body clock), including melatonin suppression (which disrupts sleep), has been proven beyond doubt. It’s a vital alertness signal for the body during the day and for this reason should absolutely be avoided at night. But the link between blue output from a monitor or other screen and melatonin is less clear, given it’s generally accepted in the scientific community that the blue light levels emitted are insufficient to disrupt melatonin. Whatever the mechanism, I am myself very sensitive to monitor usage in the night. And I regret the odd occasion I forgot to activate some form of LBL setting on monitors in the evening.

Having said that, I do tend to agree with the sentiment surrounding blue light emission from a monitor and potential eye damage. This is often overstated and an unnecessary concern, especially if the screen is a reasonable distance from the face and brightness is set to reasonable levels. And especially if precautions are taken in the evenings when you shouldn’t naturally be exposed to high blue light levels. The eye damage side of things is covered in this thread. Sleep disruption or potential damage aside, some certainly find viewing comfort benefits from reduced blue light exposure from their screen.

Edit: Worth reading this post on another thread which is relevant to this discussion.

[Jaye]

Hello!

Do you know what are the monitors that filter the most blue light? ViewSonic claims to filter 87% in their highest setting.

Asus up to 70%. Dell, HP and Benq I think don’t specify the percentage of reduction!

Thanks

[Author]

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