NEC MultiSync LCD1980FXi User Manual page 22

L1 and L2 are the display brightness levels set by the user to compensate for changes in ambient (room) lighting.
[Example 1]
Brightness level set for
the monitor to use when
operating in dim lighting
conditions (determined by
user in procedure 3)
[Example 2]
Brightness level set for
the monitor to use when
operating in dim lighting
conditions (determined by
user in procedure 3)
The high Brightness setting (L1) can not go below the low Brightness setting (L2).
when X is the same level as Y
when the user decreases the Brightness further
when the user increases the Brightness again
20
BRIGHTNESS range
Brightness level set for the monitor to
use when operating in bright lighting
conditions (determined by the user in
procedure 2)
BRIGHTNESS range
Brightness level set for the monitor to
use when operating in bright lighting
conditions (determined by the user in
procedure 2)
BRIGHTNESS range
BRIGHTNESS range
BRIGHTNESS range