Technology options for DSM in interior lighting

The objective of this paper is to educate the reader on the criteria to appraise overall energy efficiency of lighting systems and to provide guidelines for identifying energy saving options in lighting. The scope of this paper is limited to interior lighting installations like commercial buildings and industrial buildings. The methodology described in this paper helps to understand energy efficiency as referred to light sources, interior lighting design and performance assessment indicators. Luminous efficacy indicates energy efficiency of light sources, but it is not the parameter based on which quality of a lighting application is decided, for deciding quality, color rendering capability of a light source important and can be determined from its spectral properties. Hence its important to understand to assess a light source for its quality implications; this paper helps the user to do quality assessment of light sources. Lighting on the work plane in an interior depends on optical efficiency of luminaires, room dimensions and their surface reflectance. The idea of energy efficient lighting design is to provide highest luminous efficacy on the work plane by making use of efficient luminaire, room reflectance, mounting height and least lighting power consumption. Illuminating non-task areas is as critical as task areas so that there is enough luminance distribution in the background to aid in eye adaptation, safety and circulation. A energy efficient lighting interior is the best technology option for demand side management, thereby end user is encouraged to adopt way means reducing energy costs and improving lighting quality.