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Hello, I’d like to ask about Blue Light Emissions from monitors.
- Is it really bad for the eyes? Because so many monitors are sold with Low Blue Light features.
- Is there any way we can measure Blue Light Emission using DisplayCal?
- Is this Blue Light equal to the blue color displayed by monitors? Does calibrating the monitor reduce Blue Light Emissions?
Thank you.
Hello, I’d like to ask about Blue Light Emissions from monitors.
- Is it really bad for the eyes? Because so many monitors are sold with Low Blue Light features.
No. Also most low blue light features are scam, just warmer white… hence EVERY MONITOR with RGB gains can have that feature, manually
- Is there any way we can measure Blue Light Emission using DisplayCal?
Buy an spectrophotometer and create a CCSS or use spotreaf commandline over a whote patch.
- Is this Blue Light equal to the blue color displayed by monitors?
Yes. W = R +G +B
- Does calibrating the monitor reduce Blue Light Emissions?
There are two types of low blue light, the common one is just a warmer white, like D50, yellowish whitepoint. Yu can attain D50 by calibration.
There is a less common low blue light monitors. Here the backlight spectral power distribution in blue led is moved to longer wavelengths by a few nanometers. blue peak ~>455nm… so it is low blue light always even at D65. I’ve only seen 1 or 2 models of these. They are rare. 99% of low blue loght feature you see advertised is just a warmer white… and you can get it manually or by switching to a “D50” preset in OSD
Just to go into a bit more detail on the “blue light filters are scam” thing: there’s no reliable scientific evidence that blue light is harmful to your eyes, as in that it hurts them or damages them in any way. And we get a lot more blue light in sunlight than we can get from any screen. Anyone who tells you blue light hurts your eyes is talking out of their ass and has nothing to base their claims on. Unfortunately this includes even reputable companies that make glasses and/or lenses for glasses. And, yes, also monitor manufacturers. And it’s a bit of a chicken and egg situation, because the more the myth about hurtful blue light is repeated, the more people want to protect themselves from it and so the more products offer “blue light filter” that does absolutely nothing to protect anyone from anything.
There is however scientific evidence for blue light affecting melatonin production and as such affecting the quality of our sleep. It’s supposedly how we have evolved, with blue light (sunlight) during day to keep us awake and at night with no blue light (in darkness or in warm light of a fire) our bodies producing melatonin to make us fall asleep. So using one of those yellow or red “blue light” filters can be helpful in the evening and/or at night, though your mileage may vary (some people are less sensitive to this, some more). But obviously this involves lighting in general, for example avoiding using the cool white or daylight bulbs at home and especially in bedrooms.
