Advantages And Disadvantages Of Light
2.1 Lighting system
The most common perception is to view the lamp as a device used to fulfill our lighting needs. However, when searching for more energy efficient ways to meet our requirements, it is more suitable to consider lighting systems, i.e. a set of elements, which, by combining their different functions and properties, provides suitable natural and artificial light to avoid unnecessary energy losses.
The actual energy demand for a lighting application can be considerably influenced by all other components of the lighting system. Therefore, the luminous efficacy of a lamp, that is the amount of light produced for each watt of electricity consumed, is a pertinent indicator for energy efficiency, but often not the only factor to be considered when dealing with energy efficient options.
The “WISIONS” Technology Radar of Wuppertal Institute (Carmen Dienst et al., 2013, p.2) categories the
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• Accessibility of daylight is limited by the design of buildings.
• Affected orientation, number and type of windows, the floor-to-ceiling height and the layout of the rooms influence the penetration of daylight
• Most energy efficient lighting option
• positive effects on health and productivity • Affects other energy related services; heating and/or cooling rooms.
• Can become an unwanted source of heat in summer, while in winter windows can cause significant losses of (appreciable) heat.
• Has the best light to heat ratio for day lighting • Give rise to glare deteriorating light quality
• Enhances the use of natural daylight to provide illumination, minimize installed lighting loads and lighting consumption, reducing internal heat gains. • Huge amount of illumination from the sky and the sun during sunny
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