Document Type : Original Article
Improving Energy Efficiency of Lighting & Building Appliances Project. Cairo, Egypt.
Start Light Emitting Diodes (LEDs) had been profiting a great deal of interest in the last few years. LED bulbs are much more efficient, contain no toxic materials, eco-friendly, consume less energy, directional lighting, quick to turn on, and dimmable models. Scotopically Enhanced Lighting (SEL) is lighting that has more bluer in the spectrum, typically characterized by higher correlated color temperature (CCT). LED light provides better visual acuity, enhanced brightness perception, and produces a light spectrum more closely resembling daylight. Therefore, the SEL can be used at lower energy levels while maintaining equal vision. The functioning factor used on SEL is called the S/P ratio; it is equal to the proportion of scotopic to photopic lumens from a lighting source. LEDs having different values for CCT, and higher S/P ratio, can be used to describe the effective lumens of indoor lighting. Using SEL, LEDs have achieved high energy savings by advocating the use of bluer lighting in commercial and municipal buildings. This paper focuses specifically on the SEL applications and recommends replacing existing traditional lamps by LED lamps having higher CCT.