A light assembly shop, 15m long, 9m wide and 3m up to trusses, is to be illuminated to a level of 200 lux. The utilization and maintenance factors are respectively 0.9 and 0.8.
Make a scale drawing of the plan of the shop and set out the required lighting points, assuming the use of tungsten lamps and dispersive metallic reflectors.
You may assume a lamp efficiency of 13 lm/W, and spacing height ratio of unity.