Introduction to Illumination Page 1

#1 Assignment for 2011 entry

1. A playground of 10 meters x 45 meters size is to be illuminated by 10 lamps of 1000 W each. The luminous efficiency of each lamp is 20 lumens/ watt. Allowing a depreciation factor of 0.75 and utilization of 0.45, determine the illumination on ground.

2. Design a suitable lighting scheme for a factory 120 m x 40 m with a height of 7 met. Illumination required is 60 lux. State the number, location and mounting height of 40 W fluorescent tubes giving 45 lumens/ Watt. Assume depreciation factor of 1.2, utilization factor of 0.5.

3. A hall measuring 15 m x 30 m is illuminated by 20 lamps of 500 Watts each. The luminous efficiency of each lamp is 15 lumens/ watt. Allowing a depreciation factor of 0.7 and coefficient of utilization of 0.5, determine the illumination on floor.

4. A hall measuring 40 m x 16 m is illuminated by certain number of tube light fixtures of 80 W each. The illumination efficiency of each fixture is 80 lumens/ W. Allow depreciation factor of 0.65 and coefficient of utilization of 0.75. Determine the total number of fixtures required to achieve an average illumination of 175 lux on the floor.

5. A hall of 50 m x 30 m is illuminated by indirect lighting. An average illumination of 150 lumens/ sqm is to be provided on a horizontal plane parallel to the floor and 0.75 m above it. The walls and ceilings are brightly painted. Design a suitable scheme of illumination using filament lamps. Coefficient of utilization is 0.35 and depreciation factor is 0.9. If instead of indirect lighting, 80 W fluorescent lamps are used, what would be the saving in power consumption?

6. A room 12x 8 m is to have indirect lighting giving illumination of 80 lux on the working plane 70 cm above floor. Coefficient of utilization is assumed to be 0.5 and depreciation factor is 0.8. Find out the number of lamps and their ratings. Lamp efficiency may be taken as 15 lumens per watt.

Introduction to Illumination Page 2

#2 Assignment for 2011 Entry

Draw the Electrical installation plan using rough hand sketching OR Auto cad using 1:50 scale

(hint, read carefully from sample of Auto cad electrical installation that I have attached .

Introduction to Illumination Page 3