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adaptation luminance appearance approach aspect average road surface background Capenhurst changes chromaticity co-ordinates CIE Publication colour gamut colour judgement Colour Rendering Colour Rendering Index colour temperature considered daylight dimensions disability glare disc discomfort glare discrimination driver effect of lighting examined experience exposure factors fatigue field fixation fluorescent lamp fovea frequency Glare Index glare source headlights Ilium important incandescent lamp increase inspection involved Landolt ring light sources lighting criteria lighting installations limited Ltg Res luminaires luminous efficacy luminous flux luminous intensity mean measure method objects observers obtained occur offices photopic problem produced radiant flux radiation range ratio reading recommendations road surface luminance roadway lighting shown in Fig shows spatial frequencies specific spectral emission spectral sensitivity standard sunlight target threshold contrast uniform values variables veiling reflections Visibility Level vision visual acuity visual performance visual system visual task wavelength whilst windowless