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IES LM-71-14 IES Approved Guide: Photometric Measurement of Tunnel Lighting Installations
standard by Illuminating Engineering Society, 10/16/2014
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This LM guide defines adequate and uniform procedures for measuring and reporting the photometric characteristics of tunnel lighting installations. The measurement of those factors that determine theperformance of tunnel lighting installations are specifically related to ANSI/IES RP-22-11.Included in this guide are specific luminance and illuminance measurement methods applied to tunnels and the location of test points for these measurements.