Answer Happy

Question 6 (1 point) Consider the application of the Lumen Method for the design of a lighting system for a rectangular room whose length = 9.6 m and width = 3.0 m. The luminaires will be installed 3.2 m above the workplane. The design will use wall reflectance = 30% and ceiling reflectance = 70%. The photometric data for the selected luminaire is provided below. PHOTOMETRICS 2ES8PHE 232, 2725 lumens per lamp, testino. LTL19966 180° 300 600 900 1200 1500 1800 G 0⁰ 90⁰ 90° CP Summary pc 80% 70% 50% pw 70% 50% 30% 50% 30% 10% 50% 30 %10% Zone 0 90 80° 0 1829 1829 0 108 108 108 106 106 106 101 101 101 0-30° 5 1827 1817 1 100 95 92 93 90 87 89 87 84 15° 1723 1775 2 91 84 78 25° 1556 1667 3 83 73 66 35 1338 15184 76 65 57 60° 40° Coefficients of Utilization 20% 45° 1080 1332 05 70 58 50 55 788 1190 6 64 52 44 65° 504 692 7 60 47 40 151 35 0 75⁰ 231 85 61 90 2 8 56 43 36 9 52 40 32 10 49 37 30 82 76 72 72 65 60 64 57 51 57 50 44 52 44 38 47 39 34 43 35 30 39 32 27 36 29 25 79 74 70 69 64 59 62 55 50 55 49 43 50 43 38 45 39 34 Zonal Lumen Summary Lumens % Lamp% Fixture 1405 25.8 28.3 2293 42.1 46.2 0-40° 0-60° 4061 74.5 81.9 0-90° 4959 91.0 100.0 90-180° 0 0.0 0.0 0°-180 4959 91.0 100.0 41 35 30 38 32 27 35 29 25 Efficiency:91.0%
For this scenario, the value Cu will likely be closest to which of the following choices? O 1.0 0.9 O 0.8 O 0.7 0 0.6 O 0.5 O 0.4 0.3