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A 20 ft by 20 ft multi-purpose conference room has a 14 ft ceiling height and desktops at 30 inches AFF. The lighting system uses recessed downlight luminaires in a configuration of 3 rows, with 4 luminaires in each row. The room reflectance values are approximated as 80/50/20 for the ceiling, walls, and floor respectively. Technical information for the luminaires is shown below, and from that you have determined that each luminaire has 2342 lumens. What is the average illuminance produced by the lighting system in the multi-purpose room? Show your work and keep track of units as you set up and solve the equations. Specifically, show the values of the RCR and CU as part of your work.

A 20 ft by 20 ft multi-purpose conference room has a 14 ft ceiling height and desktops at 30 inches AFF. The lighting system uses recessed downlight luminaires in a configuration of 3 rows, with 4 luminaires in each row. The room reflectance values are approximated as 80/50/20 for the ceiling, walls, and floor respectively. Technical information for the luminaires is shown below, and from that you have determined that each luminaire has 2342 lumens. What is the average illuminance produced by the lighting system in the multi-purpose room? Show your work and keep track of units as you set up and solve the equations. Specifically, show the values of the RCR and CU as part of your work.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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A 20 ft by 20 ft multi-purpose conference room has a 14 ft ceiling height and desktops at 30 inches AFF. The lighting system uses recessed downlight luminaires in a configuration of 3 rows, with 4 luminaires in each row. The room reflectance values are approximated as 80/50/20 for the ceiling, walls, and floor respectively. Technical information for the luminaires is shown below, and from that you have determined that each luminaire has 2342 lumens. What is the average illuminance produced by the lighting system in the multi-purpose room? Show your work and keep track of units as you set up and solve the equations. Specifically, show the values of the RCR and CU as part of your work.
Transcribed Image Text:A 20 ft by 20 ft multi-purpose conference room has a 14 ft ceiling height and desktops at 30 inches AFF. The lighting system uses recessed downlight luminaires in a configuration of 3 rows, with 4 luminaires in each row. The room reflectance values are approximated as 80/50/20 for the ceiling, walls, and floor respectively. Technical information for the luminaires is shown below, and from that you have determined that each luminaire has 2342 lumens. What is the average illuminance produced by the lighting system in the multi-purpose room? Show your work and keep track of units as you set up and solve the equations. Specifically, show the values of the RCR and CU as part of your work.
Downlighting Calculite LED 7" gen 3 C7RDL Round Downlight Medium beam (0.9 s.c.), 2500lm Engine, 110.0 lm/w or 109.4 lm/W at 21 4W (Power over Ethernet) Candela Curve 3.000 LIGHTOLIER by Ⓒignify THE C7RN & 7RN Engie CGL258 35WZ1QU Tirn C/ROLNMCL Output lumens 2342 Ims Starodo Spacing cmt PRIMARIO HET 1 Correlated color temper 2. Teated using Josuluk pro Zonal summary Zone Lumens Luminaire Angle Mean CP Lumens o_222827948338248.8 MA---6-6 Single unit data Height to Initial center beam lighted plane in train 79 Multiple unit data - RCR 2 encenter AN CS Initial center bom foot candles 19 Beam diameter is where foot-candles drop to 50% of maximum team diameter (1) 45 54 Br Der so IL 044 017 38 7 34 × 10¹ Room Workpland, 5 above floor. 80/50/204 Refectances Efficacy 115 2 Im/w Adjustment factors. Finish LE WH oney quesUC, 100% Coefficients of utilization Ceiling Wal D BOCRI 1000K - 107% BOCHI 3500K = 100% BOCRI 3000K - 99% BOCRI 2700K. 93% SOCRI 3000K - 87 90CRI 7700K 10 50 10 50 100 Zonal cavity method - Effective floor reflectance: 20% 119 119 119 119 116 116 111 m 106 106 100 114 111 109 107 109 105 105 102 109 101 100 97 102 96 99 94 101 97 91 89 96 88 38 28 06 20 90 16 86 62822F1Z 72 66 63 72 42 Lumens 6000lm 2101 4800lm 3500lm 1401 2500m 100% 2000m - 8BOX 1500lm - 60% 1000m 40% 78 62 63 59 68 93 87 94 80 80 75 85 76 83 75 89 81 75 38682K29055 (835R$1877 specs as defined in ANSI NIUMA, ANSLG Cra 372-2008 Specifications for the Chromaticity of Solid State Lighting products Thed in LM79 IESNA Approved Method for the Electrical and Photometric Meisurements of Sond. State Lighting Products:
Transcribed Image Text:Downlighting Calculite LED 7" gen 3 C7RDL Round Downlight Medium beam (0.9 s.c.), 2500lm Engine, 110.0 lm/w or 109.4 lm/W at 21 4W (Power over Ethernet) Candela Curve 3.000 LIGHTOLIER by Ⓒignify THE C7RN & 7RN Engie CGL258 35WZ1QU Tirn C/ROLNMCL Output lumens 2342 Ims Starodo Spacing cmt PRIMARIO HET 1 Correlated color temper 2. Teated using Josuluk pro Zonal summary Zone Lumens Luminaire Angle Mean CP Lumens o_222827948338248.8 MA---6-6 Single unit data Height to Initial center beam lighted plane in train 79 Multiple unit data - RCR 2 encenter AN CS Initial center bom foot candles 19 Beam diameter is where foot-candles drop to 50% of maximum team diameter (1) 45 54 Br Der so IL 044 017 38 7 34 × 10¹ Room Workpland, 5 above floor. 80/50/204 Refectances Efficacy 115 2 Im/w Adjustment factors. Finish LE WH oney quesUC, 100% Coefficients of utilization Ceiling Wal D BOCRI 1000K - 107% BOCHI 3500K = 100% BOCRI 3000K - 99% BOCRI 2700K. 93% SOCRI 3000K - 87 90CRI 7700K 10 50 10 50 100 Zonal cavity method - Effective floor reflectance: 20% 119 119 119 119 116 116 111 m 106 106 100 114 111 109 107 109 105 105 102 109 101 100 97 102 96 99 94 101 97 91 89 96 88 38 28 06 20 90 16 86 62822F1Z 72 66 63 72 42 Lumens 6000lm 2101 4800lm 3500lm 1401 2500m 100% 2000m - 8BOX 1500lm - 60% 1000m 40% 78 62 63 59 68 93 87 94 80 80 75 85 76 83 75 89 81 75 38682K29055 (835R$1877 specs as defined in ANSI NIUMA, ANSLG Cra 372-2008 Specifications for the Chromaticity of Solid State Lighting products Thed in LM79 IESNA Approved Method for the Electrical and Photometric Meisurements of Sond. State Lighting Products:
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