Blue light from phone and tablet screen is the visible light spectrum (380-550nm) for circadian regulation, Reduce blue light can greatly improve sleep.
Night Mode filter is used to reduce blue light by adjusting the screen to natural color, night mode can relieve your eyes strain, and your eyes will feel at ease during night reading. Night mode filter will protect your eyes and help you sleep easily, it works like anti glare. You can adjust intensity of filter as per your choice, you can change brightness of filter as per your choice.