(3) This is likely their most well-known and appreciated benefit, which can provide a reduction in energy consumption. LEDs provide lumen levels equivalent to conventional outdoor lighting technologies, but can do so with greater efficacy. This nonuniformity requires the human eye to drastically adjust between these relative intensities, causing reduced visibility.įinally, conventional street lamps may contain mercury and lead, potentially harmful metals. However, they have a number of disadvantages, including a lengthy warmup time, preventing instant-on, as well as a significant restrike delay, which is required to allow the bulb to cool before it is relit.Īlso, the surface lighting is very uneven, providing intense lighting directly underneath, while relatively dim at greater angles from their nadir.
These relatively efficient technologies have a lifetime of about 25,000 hours and a reasonably low cost per kilolumen. Most of these outdoor lamps are metal halide (MH) or high-pressure sodium (HPS) sources. (2) Its main purpose is to illuminate roadway, sidewalk, and parking lot surfaces, providing improved visibility and safety conditions for drivers, pedestrians, and occupants of adjacent buildings. street and parking area lighting accounts for 178 TWh annually, roughly 23% of total lighting energy consumption. (1) With their benefits over conventional lamp technologies, LEDs are being engineered to be superior solutions in several applications. Incandescent bulbs convert 8% of their power to visible light, while fluorescents convert 21% and LEDs convert 15% - 25%, with projections of 50% in the coming years. Also, LEDs have a longer life span, require less maintenance, are vibration-resistant, contain no mercury, and do not emit infrared (IR) or ultraviolet (UV) light. In several specific lighting applications, light emitting diode (LED) products are at least as efficient as traditional technologies. This article covers solid state lighting's current and emerging applications. This two-part series discusses solid-state lighting and its envisioned use and benefits in U.S. APA style: Solid-state lighting, part 2: applications: inorganic LEDs: weighing costs and advantages.Solid-state lighting, part 2: applications: inorganic LEDs: weighing costs and advantages." Retrieved from 2010 American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc. MLA style: "Solid-state lighting, part 2: applications: inorganic LEDs: weighing costs and advantages." The Free Library.
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