This publication allows the use of SEL for interior lighting applications such as offices, libraries and schools, medical and laboratory facilities, and manufacturing and inspection applications. IES TM-24-13 concludes that light source spectral power distribution can be factored into lighting calculations for visually demanding tasks within IES Illuminance Categories P through Y. In 2013, the Illuminating Engineering Society (IES) published a Technical Memorandum that investigated the many facets of how spectrum affects vision. Savings can be optimized by installing lower-ballast-factor, extra-efficient electronic ballasts along with the higher CCT lamps. SEL installations typically use high performance fluorescent lamps with a correlated color temperature (CCT) of 5000K, in contrast to conventional fluorescent installations with CCT in the range of 3500K. The feasibility and economic benefits of SEL have been extensively studied, and case studies have documented the approach and savings realized in both new construction and retrofit applications (see Resources below).Įnergy savings from SEL-which depend on the existing lighting in the candidate space (or the proposed lighting for new construction) and the illumination requirements-are generally in the range of 20% to 40%. The examples and implementation guidance provided here pertain to fluorescent lighting. While the principles of SEL are applicable to any light source, it is predominantly used for fluorescent lighting applications in commercial and industrial settings. Since SEL provides the same levels of visual acuity with fewer lumens of output, SEL installations can be designed using fewer lamps or lower wattage lamps than traditional lighting. Studies show that, with this color shift, occupants perceive lighting to be brighter and they are able to see more clearly. It entails shifting the color of lamps from the warmer to the cooler (whiter) end of the color spectrum, more closely matching daylight. Spectrally enhanced lighting (SEL) is a cost-effective, low-risk design method for achieving significant energy savings.

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