1.6.5-7 Visibility of Light Indicators

When using legend light indicators, make sure contrast and ambient/transilluminated conditions are considered.

Additional Information:
Light intensity of the illuminated indicators should be at least 10 percent greater than the surrounding panel as measured by a spot photometer. Legends should be legible under ambient illumination with indicator lights off. Legend lettering should contrast well with background under both ambient and transilluminated lighting.