B&G H1000 Display - Manual (Page 11)

setup
light controls
The lighting level can be changed at any time by pressing the LIGHTS key. This causes the lighting level to cycle in the
sequence HIGH MEDIUM LOW OFF and then back to HIGH.
The exact levels that correspond to these settings can be adjusted on the main memories lighting menu. . . .
Display lighting levels are controlled by the LIGHTS key in normal operation, but the exact level of illumination can be
adjusted on this menu.
The levels are numbered in the order they appear when the key is used, and each level can be set in percentage
terms.
This menu page allows the lighting control to be applied either Local (this display unit only), or Zone (the entire
system).
The OK command returns the display to the main menu.