Abstract
Solid-State Lighting (SSL) technologies including Light-Emitting Diodes (LEDs) have gained substantial attention because of their lower energy consumption over conventional lighting technologies. However, energy savings is only one aspect of effectiveness of LEDs. The quantity and quality of illumination together with the economic feasibility are also important in the determination of overall effectiveness. This study was carried out to evaluate all aspects of an installation of SSL, including energy savings, illumination quality, costeffectiveness, human performance and waste disposal. The study focused on a design that replaces fluorescent lamps (most commonly “T8” linear lamps) with LED products in a commercial building. The lighting level of the working plane at 00 degree of vertical angle was measured to be 370 lux ±12 for LED lamps and 144 lux ± 44 for fluorescent lamps. The lighting level of the 300 degree and 600 degree vertical angle were indicated as 365 lux for LED lamp and 100 lux for fluorescent lamp. This shows the lighting level of the LED is meeting with required standard (IESNA) which has given the range, 250-450 lux for a study area and an office environment. However, the florescent lighting was below the required level. The range of detected correlated colour temperature was 6000K – 6500K for both the lamps. In the associated survey among users of the space, more than 65% of the sample population provided a positive feedback on LED lighting system in relation to the human performance factors such as visibility, mood effect, visual health, colour appearance and work performance. Considering the above factors, LED lamps can be recommended as efficient and eco-friendly lighting systems for illumination of domestic and commercial buildings.
Highlights
With the technological and industrial development, global energy consumption would considerably increase, from 12 billion toe in 2009 to 18 billion toe in 2035 [1]
In the associated survey among users of the space, more than 65% of the sample population provided a positive feedback on Light-Emitting Diodes (LEDs) lighting system in relation to the human performance factors such as visibility, mood effect, visual health, colour appearance and work performance
The installed capacity for electricity generation from hydro, thermal and wind power presently stands at 3500 MW by 2016, compared with 1,409 MW in 1999
Summary
With the technological and industrial development, global energy consumption would considerably increase, from 12 billion toe (tone of oil equivalent - toe) in 2009 to 18 billion toe in 2035 [1]. It is vital to promote sustainable consumption of energy and to enhance the energy efficiency of all devices, to ensure long term sustainability of global energy supply. Consisting of a total land area of 65,610 square kilometers, Sri Lanka is home to a population of 20 million people. Sri Lanka’s energy mix consists primarily of biomass, hydro-electricity and petroleum that contribute 47%, 8% and 45% of total energy, respectively. The demand for electricity is estimated to rise at an annual pace of 5% to 7%. Annual per capita consumption of electricity was 394 kWh per person in 2006 and has since risen to about 600 kWh/person in 2016
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