Yes. Please open https://myvobot.com, go [Settings] - [Display Options], choose LED brightness modes among "Auto", "Manual", "Keep Off Till Next Alarm/Timer".

• Auto: this feature is referred to as 'adaptive brightness'. Vobot Clock can adjust the brightness of the display based on how much light is reaching the system's ambient light sensor. The LED screen will dim at night, which can protect the eyes and be good for the sleep quality.
• Manual: set the brightness to a fixed level.
• Keep Off Till Next Alarm/Timer: for those prefer a complete darkness while sleeping, this option will turn off the display, and turn back on upon next alarm/timer going off. (then stay in Auto mode).