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Assessment of Energy-Efficient Lighting Systems in Public Buildings

Abstract

Lighting is an essential component of public buildings, supporting visual tasks, safety, communication, circulation, and overall user comfort. However, conventional lighting systems can contribute significantly to building energy consumption, particularly in facilities with long operating hours and large occupied spaces. The adoption of energy-efficient lighting systems provides an opportunity to reduce electricity demand while maintaining appropriate levels of illumination and visual quality. Assessing the performance of such systems is therefore important for improving the environmental and operational efficiency of public buildings. This study assesses energy-efficient lighting systems in public buildings, focusing on their effectiveness in reducing energy consumption while meeting functional lighting requirements. The assessment considers different lighting technologies, including LED systems, efficient fluorescent alternatives, occupancy-controlled lighting, daylight-responsive systems, and other intelligent lighting solutions. Factors such as energy consumption, illumination levels, operating hours, maintenance requirements, and system efficiency are examined to evaluate overall lighting performance. The study also examines the relationship between lighting design and building characteristics. Room size, ceiling height, surface reflectance, window placement, daylight availability, space function, and occupancy patterns can influence the amount of artificial lighting required. Integrating energy-efficient artificial lighting with daylighting strategies can reduce unnecessary electricity use while maintaining suitable visual conditions for occupants. Control systems are another important consideration in improving lighting efficiency. Occupancy sensors, daylight sensors, timers, dimming systems, and centralized lighting controls can help ensure that lighting is provided only when and where it is required. The effectiveness of these technologies may depend on their configuration, reliability, user acceptance, and compatibility with existing electrical systems. User behaviour is therefore considered alongside technological performance when assessing energy-efficient lighting systems. Despite the potential benefits, public buildings may face challenges in adopting energy-efficient lighting systems due to initial investment costs, inadequate maintenance, limited technical knowledge, outdated electrical infrastructure, and resistance to changes in established operating practices. Poorly designed lighting systems may also create glare, inadequate illumination, or uneven light distribution. Effective implementation therefore requires consideration of both energy performance and the visual needs of building users. The study aims to evaluate the performance of energy-efficient lighting systems in public buildings and identify strategies for improving lighting efficiency without compromising occupant comfort and safety. The findings are expected to provide useful guidance for architects, electrical engineers, facility managers, and public-sector decision-makers in selecting and managing appropriate lighting systems. The study can contribute to reduced operational energy consumption, lower maintenance costs, improved visual environments, and more sustainable public buildings.

Keywords: Energy-efficient lighting, Public buildings, LED lighting, Lighting energy consumption, Visual comfort, Daylighting, Lighting controls, Occupancy sensors, Illumination levels, Building energy performance, Dimming systems, Sustainable lighting, Lighting design, Energy conservation.