TABLE 107.5 Direct Illumination Components for Category III Luminaire(Based on F40 Lamps Producing 3100 Lumer Direct Illumination Components 515253545556575515253545556575 Vertical Surface Illumination Footcandles at a Vertical Surface Illumination Footcandles at a Point on a plane parallel to luminaires Point on a Plane Perpendicular to Luminaires 93.3 1.85.07.07.76.63.81.52 84.3271.13 1297.7 3.2.512.6 92.1.6 3019,5a212121m5112 76.81.4 232267 17 352 26.723.819.714.98.74.3 1941347.5 27.124.220.115.39.14.71.1 FC. at a Point on Work plane Category Ill 10.69.57.6 1.616.0984.01.1 9541.5 41.838.1 .76.72.0 45.241.334.8 6792.62 46.943.036.428318.98.93.23 43 47.543.737.028.8194933.54 For T-10 Lamps.=CU×1.02 Luminance Coefficients for 20% Effective Floor Cavity Reflectance Ceiling Cavity WDRC RCR Wall Luminance coefficients eiling Cavity Luminance Coefficients 127 115182 .115 .202 161088 .158077145 72.130066.190.139113085021016 072 35110082021 14910 .141068130064116059 18013 107080020 107.2 Factors Affecting industrial illumination asic definitions Illuminance. luminance is the density of luminous lux on a surface expressed in either footcandles Luminance(or photometric brightness). Luminance is the luminous intensity of a surface in a given direction of projected area of the sur candelas per unit area or in lumer unit area Reflectance. Reflectance is the ratio of the light reflected from a surface to that incident upon it. Reflection may be of several types, the most common being specular, diffuse, spread, and mixed Glare. Glare is any brightness that causes discomfort, interference with vision, or eye fatigue e 2000 by CRC Press LLC© 2000 by CRC Press LLC 107.2 Factors Affecting Industrial Illumination Basic Definitions Illuminance. lluminance is the density of luminous lux on a surface expressed in either footcandles (lumens/ft2 ) or lux (lx) (lux = 0.0929 fc). Luminance (or photometric brightness). Luminance is the luminous intensity of a surface in a given direction per unit of projected area of the surfaces, expressed in candelas per unit area or in lumens per unit area. Reflectance. Reflectance is the ratio of the light reflected from a surface to that incident upon it. Reflection may be of several types, the most common being specular, diffuse, spread, and mixed. Glare. Glare is any brightness that causes discomfort, interference with vision, or eye fatigue. TABLE 107.5 Direct Illumination Components for Category III Luminaire (Based on F40 Lamps Producing 3100 Lumens) Direct Illumination Components 8 5 15 25 35 45 55 65 75 5 15 25 35 45 55 65 75 Vertical Surface Illumination Footcandles at a Vertical Surface Illumination Footcandles at a µ Point on a Plane Parallel to Luminaires Point on a Plane Perpendicular to Luminaires 0–10 .9 2.6 3.6 3.9 3.3 1.9 .7 .1 .9 .8 .7 .5 .3 .1 — — 0–20 1.8 5.0 7.0 7.7 6.6 3.8 1.5 .2 3.6 3.2 2.7 1.9 1.2 .5 .1 — 0–30 2.6 7.2 10.1 11.3 9.8 5.7 2.3 .3 7.7 7.0 5.8 4.3 2.7 1.1 .3 — 0–40 3.2 9.0 12.8 14.5 12.9 7.7 3.2 .5 12.6 11.6 9.7 7.5 4.9 2.1 .6 — 0–50 3.7 10.3 14.9 17.1 15.7 9.6 4.3 .7 17.8 16.6 14.2 11.2 7.7 3.4 1.1 .1 0–60 4.0 11.2 16.3 18.8 17.6 11.3 5.5 1.0 22.6 21.2 18.4 14.7 10.4 5.1 1.9 .2 0–70 4.1 11.6 17.0 19.8 18.9 12.7 6.8 1.4 26.2 24.7 21.8 17.8 13.1 7.2 3.2 .3 0–80 4.1 11.7 17.3 20.2 19.4 13.3 7.4 1.9 28.2 26.7 23.8 19.7 14.9 8.7 4.3 .8 0–90 4.1 11.7 17.3 20.2 19.4 13.4 7.5 2.0 28.6 27.1 24.2 20.1 15.3 9.1 4.7 1.1 F.C. at a Point on Work Plane Category III 0–10 10.6 9.5 7.6 5.5 3.3 1.3 .3 — 0–20 20.6 18.5 14.9 10.9 6.6 2.6 .7 — 0–30 29.4 26.5 21.6 16.0 9.8 4.0 1.1 — 0–40 36.5 33.1 27.4 20.6 12.9 5.4 1.5 — 0–50 41.8 38.1 31.9 24.3 15.7 6.7 2.0 .1 0–60 45.2 41.3 34.8 26.8 17.6 7.9 2.6 .2 0–70 46.9 43.0 36.4 28.3 18.9 8.9 3.2 .3 0–80 47.4 43.6 36.9 28.8 19.4 9.3 3.5 .4 2 T-12 Lamps—Any Loading 0–90 47.5 43.7 37.0 28.8 19.4 9.3 3.5 .4 For T-10 Lamps—CU 3 1.02 Luminance Coefficients for 20% Effective Floor Cavity Reflectance Reflectances Ceiling Cavity 80 50 10 80 50 10 Walls 50 30 50 30 50 30 50 30 50 30 50 30 WDRC RCR Wall Luminance Coefficients Ceiling Cavity Luminance Coefficients .281 1 .246 .140 .220 .126 .190 .109 .230 .209 .135 .124 .025 .023 .266 2 .232 .127 .209 .115 .182 .102 .222 .190 .130 .113 .024 .021 .245 3 .216 .115 .196 .105 .172 .095 .215 .176 .127 .105 .024 .020 .226 4 .202 .102 .183 .097 .161 .088 .209 .164 .124 .099 .023 .019 .212 5 .191 .097 .173 .090 .154 .082 .204 .156 .121 .094 .023 .018 .196 6 .178 .090 .163 .084 .145 .076 .200 .149 .118 .090 .022 .017 .182 7 .168 .083 .153 .078 .136 .071 .194 .144 .115 .087 .022 .017 .170 8 .158 .077 .145 .072 .130 .066 .190 .139 .113 .085 .021 .016 .159 9 .150 .072 .138 .068 .123 .062 .185 .135 .110 .082 .021 .016 .149 10 .141 .068 .130 .064 .116 .059 .180 .131 .107 .080 .020 .016