Question

Problem 3.9 A drawing hall in an engineering college is to be provided with a lighting installation. The hall is 30 m x 20 m x 8 m ( high ). The mounting height is 5 m and the required level of illumination is 144 lm / m". Using metal filament lamps, estimate the size and number of single lamp luminaries and also draw their spacing layout. Assume : Utilization coefficient = 0.6, maintenance factor = 0.75, space / height ratio = 1, lumens / W for 300 W lamps = 13 lm / W, lumens / W for 500 W lamps = 16 lm / W, ( Answer : 24 nos – 500w, 6 x 4, 1 m below ceiling )

          Problem 3.9
A drawing hall in an engineering college is to be provided with a lighting installation. The hall
is 30 m x 20 m x 8 m ( high ). The mounting height is 5 m and the required level of illumination
is 144 lm / m". Using metal filament lamps, estimate the size and number of single lamp
luminaries and also draw their spacing layout.
Assume : Utilization coefficient = 0.6, maintenance factor = 0.75, space / height ratio = 1,
lumens / W for 300 W lamps = 13 lm / W, lumens / W for 500 W lamps = 16 lm / W,
( Answer : 24 nos – 500w, 6 x 4, 1 m below ceiling )

Problem 3.9
A drawing hall in an engineering college is to be provided with a lighting installation. The hall
is 30 m x 20 m x 8 m ( high ). The mounting height is 5 m and the required level of illumination
is 144 lm / m". Using metal filament lamps, estimate the size and number of single lamp
luminaries and also draw their spacing layout.
Assume : Utilization coefficient = 0.6, maintenance factor = 0.75, space / height ratio = 1,
lumens / W for 300 W lamps = 13 lm / W, lumens / W for 500 W lamps = 16 lm / W,
( Answer : 24 nos – 500w, 6 x 4, 1 m below ceiling )

Added by Alvaro S.

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