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F1157 Pages: 3

A room 8m x12m is lighted by 15 lamps to a fairly uniform illumination of
100 Im/m?. Calculate the utilisation factor of the room, given that the output of
each lamp is 1600 lumens.

What are the advantages and disadvantages of using LED light as street light?

Define up cast angle, outreach, pole set back and mounting height in street

lighting. Give a clear picture showing all these.
Explain the different types of fixtures used in street lighting.

An assembly line space has an area of 40 m long, 20 m wide and 8 m in height.
The luminaires are suspended 1.5 m below the ceiling level. The work table are
placed 1 m high from the floor level. Calculate the minimum number of
luminaires which must be installed to conform a recommended SHRmmax
(Space.height ratio) of 1.5. Show the layout of the luminaires. Also calculate the
average illuminanace achieved with the minimum number of luminaires with
each luminaire fitted with 4 numbers of fluorescent lamps with an initial lamp
flux of 1350 lumen. Assume MF=0.77 and UF= 0.75
PART 0

Answer any two full questions, each carries 10 marks.
A building frontage 50m x 25m is to be illuminated by flood lighting projectors
situated 25m away. If the illumination is 50 lux, coefficient of utilisation is 0.5,
depreciation factor 1.5, waste light factor 1.2. Estimate the number and size of
projectors. Sketch the projectors recommended indicating the adjustments
provided.
What are different factors to be considered while designing aesthetic illumination
of bridges and statues?
What is the importance of modelling and shadows in the case of sports field
lighting?
What are the different methods available for aiming of lamp in flood lighting?
The boundary of a football stadium is 100m x 50m. The recommended
illumination level is 500 lux. Luminaries of 1000W with light output of 92000
lumens are used for installation. Calculate the number of luminaries required to
get the recommended level of illumination. Assume utilisation factor = 0.8,
maintenance factor = 0.8, light loss factor = 1.2. Sketch the configuration of light
fittings.

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