Lighting system design according to different standards in office building: A technical and economic evaluations

Abstract

Lighting system is an important sub-system in office 
\nbuildings. A good design can contribute energy saving and visual 
\ncomfort to occupants. This paper presents a comparison of lighting 
\nsystem design according to different standards: European Standard 
\nEN12464-1 and Malaysian Standard MS1525 in terms of average 
\nilluminance level and illuminance uniformity. In the design, the 
\nilluminance measurement is according to the Illuminating Engineering 
\nSociety of North America (IESNA) and the European Standard 
\nEN12464-1. Three types of luminaires are considered which are: T8, 
\nT5 and light emitting diode (LED) lamps. The technical and economic 
\nevaluations are taken into account in this paper. The technical 
\nevaluations are considered the number of luminaires, average 
\nilluminance level and illuminance uniformity. The energy 
\nconsumption (EC) and lighting energy numeric indicator (LENI) are 
\nconsidered according to the European Standard EN15193. Meanwhile, 
\nthe economic evaluation involves billings and luminaires costs and 
\nbilling savings. The case study is an office room and it is modelled 
\nand simulated using DIALux software. The results show that the 
\ndesign according to the European Standard EN12464-1 with 
\nuniformity based method that used T5 lamps had contributed to the 
\nhighest number of luminaires and costs. Whereas, the design 
\naccording to the Malaysian Standard MS1525 with illuminance level 
\nbased method that used LED lamps had contributed to the lowest 
\nnumber of luminaires and costs. Thus it can provide the higher billing 
\nsavings. It can be concluded the LED has great potential to replace T8 
\nand T5 lamps.