Transcription of General information: Photometric calculation - Vlux
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General information: Photometric calculation - Vlux
General information : Photometric calculation 1. STREETLIGHTING QUALITY CIE specifies different roadsurfaces what reflection CHARACTERISTICS properties are concerned: R1 = DIFFUSE REFLECTION. To calculate the quality characteristics, the light R2 = DIFFUSE-COMPOUND REFLECTION. distribution of the luminair is measured, the R3 = SPECULAR-COMPOUND REFLECTION. light intensity (cd/klm) is measured for a number of R4 = SPECULAR REFLECTION. C and gamma angles. The result of the calculation is a table with the luminance value of a number of points on the street. C = 180 . C = 270 . The quality of the streetlighting depends on: - AVERAGE LUMINANCE. C = 0 C = 90 - LUMINANCE UNIFORMITY. - GLARE CONTROL. Values of average luminance and uniformity (ratio between minimum an mean or maximum luminance values) are deducted from luminance table. Glare is evaluated by Treshold Increment (TI) and glare mark (G), which are calculated by means of empiric formulas.
General information: Photometric calculation VIEWING ANGLES 3. GLARE EVALUATION FOR INTERIOR LIGHTING To prevent glare, the luminance values in the range of the viewing angles
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