What key do I press to turn on "Extra Lights" on ETS2?

There are these Light Bars and Lights you can put on them, but I can't figure out how to turn them On pressing a Key on the Keyboard on ETS2 (Euro Truck Simulator 2).

2 Answers

You have to press the F4 Key to enter in the light adjustment menu.

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On my game I've found that 'o' is the game default for beacons

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