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A room with the internal dimensions of 25 (m) length * 25 (m) width * 3 (m) height is to be artificially lit by luminaires mounted at ceiling level. This room required the illuminance of 400 (lx) on the working planes 0.5 (m) above the floor. The 100 (W) tubular florescent lamps with initial luminous efficacy of 79 (lm/W) and basic downward Light Output Ratio (LOR) of 50% are selected to provide the required artificial light. Florescent lamps are placed in recessed louver through luminaires with optically design reflecting surfaces. The reflectance of ceiling is 0.5 (-) and the reflectance of walls is equal to 0.3 (-); the light loss factor is 0.8 (-). Reflectances Description of fitting/ typical outline LOR Basic down- ward LOR (%) 0.7 0.5 0.5 0.5 0.3 0.5 0.3 0.1 0.3 0.1 0.3 0.1 Ceiling Walls Room index 70 coco ထ Aluminium industrial reflector, aluminium or enamel high- bay reflector 0.6 0.8 1.0 1.25 1.5 2.0 2.5 3.0 4.0 5.0 0.6 0.8 1.0 1.25 1.5 2.0 2.5 50 Near- spherical diffuser, open beneath 0.39 0.48 0.52 0.56 0.60 0.65 0.67 0.69 0.71 0.72 0.28 0.39 0.43 0.48 0.52 0.58 0.62 0.65 0.68 0.71 0.28 0.34 0.37 0.40 0.43 0.46 0.48 0.49 0.50 0.51 0.36 0.43 0.49 0.53 0.57 0.62 0.64 0.66 0.68 0.70 0.22 0.30 0.36 0.41 0.46 0.52 0.56 0.60 0.64 0.60 0.25 0.31 0.36 0.38 0.41 0.44 0.46 0.47 0.49 0.50 Oololo olololololo Oslo Lolololo 0.33 0.40 0.45 0.50 0.54 0.59 0.62 0.64 0.67 0.69 0.18 0.26 0.32 0.37 0.41 0.47 0.52 0.56 0.61 0.65 0.23 0.28 0.32 0.35 0.38 0.42 0.44 0.46 0.48 0.49 0.39 0.46 0.52 0.56 0.59 0.63 0.65 0.67 0.69 0.71 0.25 0.33 0.38 0.42 0.46 0.50 0.54 0.57 0.60 0.62 0.28 0.33 0.37 0.40 0.42 0.45 0.47 0.48 0.49 0.50 0.36 0.43 0.48 0.53 0.57 0.60 0.62 0.64 0.67 0.69 0.20 0.28 0.34 0.38 0.41 0.48 0.50 0.53 0.56 0.59 0.25 0.30 0.34 0.37 0.40 0.43 0.45 0.46 0.48 0.49 0.33 0.40 0.45 0.49 0.53 0.58 0.61 0.63 0.65 0.67 0.17 0.23 0.29 0.33 0.37 0.43 0.47 0.50 0.54 0.57 0.23 0.28 0.32 0.35 0.38 0.41 0.43 0.45 0.47 0.48 0.39 0.46 0.52 0.56 0.59 0.63 0.65 0.67 0.69 0.71 0.22 0.27 0.31 0.34 0.37 0.42 0.45 0.48 0.51 0.53 0.28 0.33 0.37 0.40 0.42 0.44 0.46 0.47 0.48 0.49 0.35 0.43 0.48 0.52 0.57 0.59 0.62 0.64 0.66 0.67 0.18 0.25 0.29 0.32 0.35 0.39 0.42 0.45 0.48 0.50 0.25 0.30 0.34 0.37 0.39 0.42 0.44 0.45 0.47 0.48 0.33 0.40 0.45 0.42 0.53 0.57 0.60 0.62 0.64 0.66 0.16 0.22 0.26 0.29 0.32 0.36 0.40 0.43 0.46 0.48 0.23 0.28 0.32 0.35 0.38 0.41 0.43 0.44 0.46 0.47 3.0 50 4.0 5.0 0.6 0.8 1.0 1.25 1.5 2.0 2.5 3.0 4.0 5.0 Recessed louvre trough with optically designed reflecting surfaces CANON TT
Determine the: Room Index Utilisation factor (UF) of the luminaires using Table Number of luminaires (considering one florescent lamp fitted in each luminaire) Maximum horizontal space between luminaries Layout of the luminaires considering the maximum horizontal space between light fittings