The DualShock 4’s lightbar is a nifty thing. It works with many games to mimic what’s happening on screen — for example, in The Last of Us it will change colors as your health deteriorates and blush as you die. It’s petty, but it’s cool. The downside is that it also drains the battery, causing the controller to die much faster than most of us would like. Fortunately, you can darken it.
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To get started, enter the PlayStation settings menu. This is indicated by a small suitcase icon.
On the main settings screen, scroll down until you see «Devices» and jump there.
Then select Controllers.
The last option in this menu is DUALSHOCK 4 Lightbar Brightness. This is what you are looking for.