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Smart Wireless Sensor Networks for Street Lighting
Published in Tuan Anh Nguyen, Ram K. Gupta, Nanotechnology for Light Pollution Reduction, 2023
Hadis Foladi, Ali Mir, Ali Farmani, Mensah-Darkwa Kwadwo, Tuan Anh Nguyen
LEDs are now employed as a new service all over the world, and yellow-light products are no longer manufactured. LEDs are used for a variety of reasons, including: Light Quality: white LED light makes items more recognized, has more and better security and presents a superior light design that is accessible with traditional sources, resulting in more lighting and less pollution.Energy-Saving: LED lighting is more efficient than traditional technologies, saving 40%–80% of energy through its design.Less Maintenance: LEDs have a longer lifespan than traditional technologies and result in lower costs.Smart Light Control: LED streetlight systems with smart light regulating systems are more accessible and offer additional benefits. It benefits municipalities while also reducing light pollution. Figure 12.1 shows the prediction of the LED market globally from 2009 to 2015 [10].
Fundamentals of Visible Light Communication
Published in Mohsen Kavehrad, Reza Aminikashani, Visible Light Communication Based Indoor Localization, 2019
Mohsen Kavehrad, Reza Aminikashani
As mentioned earlier, VLC systems mostly use semiconductor LEDs as transmitters due to their advantages and rapid developments in LED fabrication. Currently, lighting LEDs offer a transmission bandwidth range between 20 MHz to over 100 MHz, and as shown in Fig. 2.2, one LED bulb is composed of a number of LED chips. LED lighting offers many advantages over conventional lighting, such as low power consumption, low cost, high luminance efficiency, long lifetime, etc. For these reasons, LEDs have become strong in the lighting market compared to traditional lighting solutions [2]. Besides these advantages, the intensity of the light emitted by an LED light can be modulated rapidly as it is a semiconductor device. This way, the LED combines its function of lighting with that of a data communication transmission system. It should be noted that LEDs are an incoherent light source, that is, LED light is not monochromatic and LED generates light with a broad bandwidth.
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Published in Barney L. Capehart, Wayne C. Turner, William J. Kennedy, Guide to Energy Management, 2020
Barney L. Capehart, Wayne C. Turner, William J. Kennedy
LEDs, or light–emitting diodes, are semiconductor devices that produce visible light when an electrical current is passed through them. LEDs are a type of Solid State Lighting (SSL), as are organic light–emitting diodes (OLEDs) and light–emitting polymers (LEPs). LED lighting differs from incandescent and compact fluorescent lighting in several ways. When designed well, LED lighting can be more efficient, durable, versatile and longer lasting. LED lighting products use light emitting diodes to produce light very efficiently. An electrical current passes through semiconductor material, which illuminates the tiny light sources we call LEDs. The heat produced is absorbed into a heat sink.
Supraharmonics reduction in LED drivers via random pulse-position modulation
Published in International Journal of Electronics, 2018
Joaquin Garrido-Zafra, Antonio Moreno-Munoz, Aurora Gil-De-Castro, Manuel A. Ortiz-López, Tomás Morales
Worldwide present urbanisation patterns have impelled the need for lighting sources, which has derived in a greater demand for electricity. Lighting is responsible for approximately 20% of the global electricity consumption and about 6% of greenhouse gas emissions (Waide, Tanishima, & Harrington, 2006). In the quest for energy efficiency, the light-emitting diode or LED light has entailed an energy revolution, involving energy savings of up to 80% compared to incandescent lamps (‘How Energy-Efficient Light Bulbs Compare with Traditional Incandescents | Department of Energy,’ n.d.). The shift to LED light is transforming the lighting industry, which has seen a faster than expected drop-off in the price of this disruptive technology. An LED is a two-layer semiconductor light source. LED lighting not only delivers high efficiency but also high level of brightness, long lifespan and high reliability. Consequently, LED lamps are employed nowadays in most of the applications: indoor and outdoor, such as street lights or parking garage lighting. The EU’s decision to finally phase out sales of incandescent lamps by 2012 and similar actions in countries such as China, Russia and Brazil are all leading to a sharp increase of power electronic converters (PEC) needed for this lighting technology. Market forecasts estimate extraordinary and continuous growth of LED market throughout present decade, with LED becoming the dominant lighting technology in terms of total number of installed units, with a share reaching almost 70% of the global lighting market in 2020 (Baumgartner et al., 2012).
An Economic analysis of the Luminaire-Level control of LED lighting in small office
Published in Journal of Asian Architecture and Building Engineering, 2022
LED (light emitting diode) lighting with characteristics such as eco-friendliness and high efficiency has attracted attention to reducing the energy consumed by lighting (Kim et al. 2020). LED lighting has a higher unit cost and higher initial cost compared to fluorescent lamps, however, energy consumption and carbon emissions are lower due to low power consumption and the longer lifespan of the light source (Cho et al. 2012).
Effect of correlated colour temperature and illuminance levels on user’s visual perception under LED lighting in Taiwan
Published in Ergonomics, 2020
Wei-Cheng Chao, Li-Ying Hong, Min-Chih Hsieh, Eric Min-Yang Wang, Chi-Chin Yang, Li-Chi Su
Light-emitting diode (LED) lighting has the advantages of being more economical and energy-efficient than traditional lighting. Moreover, LED lighting is equipped with tuneable illuminance levels and colour temperatures that can satisfy the requirements of end users. Therefore, LED lighting has become the major light source, gradually replacing traditional lighting (Islam et al. 2015; Wang et al. 2017).