Brightness is a tool to control your screen brightness. If you are using a laptop turning down your screen brighness can increase battery life by a large amount as well however too dim and the screen will be illegible.
Useage
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To use brightness click on the dial towards the right window of the window. To make the screen dimmer use the left arrow key or click on the dial and drag it towards the left. If you want to make the screen more bright press the right arrow key or drag the dial towards the right.
To launch brightness from the menu -> Prefrences -> LXQt settings -> Brightness. Another way is to press the birghtness button on LXQt configuration center or run lxqt-config-brightness from the commandline.
