Dim the lights on that DualShock 4, baby, and let's set the mood. According to Sony exec Shuhei Yoshida, you won't be able to turn off the lightbar on the PS4's controller completely after a firmware update in the near future but you will be able to lower the brightness of the LED.

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In before lots of dumb people claiming it would improve battery life, even though LEDs consume very little amounts of power.