The PS4 controller comes with a built in blue LED light at the top also called a 'Light Bar'. You might want to turn off this feature to increase the battery life. Unfortunately, you can't exactly turn off the blue light on the PS4 controller, however you can dim it to make it appear less brighter.
1) Hold down the 'PS' logo button in the middle.
2) Select 'Adjust Devices' option.
3) Enter 'Brightness of Dualshock 4 light bar'.
4) You will have different levels to adjust the power from the settings. Select the appropriate one that you consider most suitable towards your liking.
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