[9.4.9.1.4] The ratio of the illuminance (or exitance or luminance) provided when a lighting system is allowed to operate with a set number of lamps burned out to that provided with all lamps operating.
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[9.4.9.1.4] The ratio of the illuminance (or exitance or luminance) provided when a lighting system is allowed to operate with a set number of lamps burned out to that provided with all lamps operating.
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