Lenovo ThinkVision P27u-20 27" 4K IPS Monitor - Manual (Page 39)

Appendix B Troubleshooting B-5
Low Blue Light
Concerns on blue light affecting eye health have risen over the years. Blue light have
wavelength between 300 nm to 500 nm. The monitors have a factory setting that reduces blue
light emissions. Users can enable low blue light mode on these monitors from the OSD
settings.
1. Press to open the main OSD menu.
2. Use or to move among the icons. Select icon (Advanced Setting) and press
to access this function.