Effects of Lighting Quality on Working Efficiency of Workers in Office Building in Tanzania

Table 1

A summary of the offices’ physical characteristics and lighting condition in the surveyed offices.

Office	Function	Parameters	Physical characteristics
1	Office of Head of Department (Architecture) located in the first floor	Ceiling	Plasterboards at 3.485 m above floor painted white and decorated to matt finish hardwood
		Walls	Plastered concrete blocks painted off white
		Floor	Red carpet
		Working plane	Matt finish hardwood table, close to the window, at 0.714 m above the floor
		Lighting characteristics	Both naturally and artificially lit; clear glass on the window with translucent curtain, four ceiling-mounted fluorescent tubes TU and T8, 36 W, fixed on magnetic ballasts
		Humidity and temperature	The humidity was 65%, and the temperature was 23°C
2	Staff’s office (Architecture Department) located in the second floor	Ceiling	Gypsum board, painted in white color
		Walls	Plastered concrete block painted in white color
		Floor	Cement sand screed
		Working plane	Mixed type of furniture, ergonomics not well adhered to
		Lighting characteristics	Both naturally and artificially lit, a small side window with clear glass and a translucent curtain, three surfaces mounted fluorescent tube Philips T8, 36 W fixed on a magnetic ballasts
		Humidity and temperature	The humidity was 70%, and the temperature was 25°C
3	Accounting office located in the basement	Ceiling	Concrete soffit painted white at 3.213 m headroom
		Walls	Plastered and waterproofed concrete block, painted in white color
		Floor	White ceramic tiles
		Working plane	Matt and gloss finish hardwood tables at 0.75 m above the floor
		Lighting characteristics	Artificially lit, with a ventilation window at ceiling level supplied with mosquito gauze, two fluorescent tubes TU and T8, 36 W, fixed on magnetic ballasts and mounted on ceiling soffit
		Humidity and temperature	The humidity was 75%, and the temperature was 21°C
4	Estate manager’s office located in the first floor	Ceiling	Gypsum board at 2.8 m from the floor
		Walls	Concrete blocks, plastered and painted off-white
		Floor	Cement sand screed
		Working plane	Matt and gloss finish hardwood tables at 0.75 m above the floor
		Lighting characteristics	Both naturally and artificially lit; clear glass on the window with translucent curtain, one pendant fluorescent tubes TU and T8, 36 W, fixed on magnetic ballasts mounted on the wall at ceiling level
		Humidity and temperature	The humidity was 66%, and the temperature was 23°C