What is Blue light filter option in Samsung Galaxy J2?

The blue light filter will adjust the screen’s lights to reduce eye strain while you are looking at the screen.

Note : While you are watching HDR videos from HDR-exclusive video services, the blue light filter may not be applied.

Please follow the steps listed below to turn on Blue light filter:

Navigate to Setting > Tab Display > Tab Blue light filter > Adjust Opacity or Adjust Opacity in Notification panel     

Pictorial Representation of the above settings are as follows: 

Now select an option.

• Sunset to sunrise : Set the device to apply the blue light filter at night and turn it off in the morning, based on your location.

• Custom schedule : Set a specific time to apply the blue light filter.