You have to use the button to turn the light on. The menu item is disabled when the light is off. When it is on, it wlll show the brightness level and pressing it displays the brightness control.
If the light is not coming on when you press the button, does the light icon display at the top of the screen? If so, it means you are seeing a bug in the current firmware. If the light level is set to 1%, the light doesn't come on until you adjust the light level. If it is set it to 2% or higher, it will come on with no problems.
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