What does blue light filtering, which is advertised by, for example, Viewsonic, Asus, AOC and Benq in their monitors, actually does? Is it something as simple as they lower the level of blue color in RGB which can also be manually done from OSD menu (obviously then they also auto adjust red and green colors to each level of blue light reduction)? Or is it also something hardware related as well: is there an actual physical filter and/or do these monitors keep better color quality with lower blue light? To sum it up can you manually or with a help of f.lux adjust the settings of blue light to reach the same outcome on a monitor which does not have blue light filtering in comparison to the monitor which offers blue light filtering?