Epson Moverio Pro BT-2000 Developer's Manual page 121

7.1.2. ALS
The BT-2000 is equipped with an ALS (ambient light sensor). This sensor allows the device to
acquire the ambient light for the user's surroundings. Also, the BT-2000 is equipped by standard
with automatic optics that auto adjust the display brightness according to the user's surroundings.
To activate, open [Settings] apps and [Display][Screen brightness], and check the [Brightness
automatically control].
The following shows the specifications for the ALS.
MOVERIO Pro Developer's Guide (Rev.1.4)
Sampling rate
ALS Approx. 1[Hz]
115
Range
0 to 65528 lx