4.2.6.2-4 Brightness Levels for Transilluminated Displays

For transilluminated displays, such as lighted alarm tiles, the luminance of the dim state (if used) should be at least 10 percent greater than the inactivated state; the brightest state should not be more than 300 percent of the surrounding luminance.

Additional Information:
Transilluminated displays should have no more than 3 levels. Brightness of 'on' alarms should not be annoying or distracting.