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Juntunen, E.; Tetri, E.; Tapaninen, O.; Yrjänä S.; Kondratyev, V; . Sitomaniemi, A.; Siirtola, H.; Sarjanoja, E.M.; Aikio, J.; Heikkinen, V |
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A smart LED luminaire for energy savings in pedestrian road lighting. |
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2013 |
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Lighting Research and Technology |
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47 |
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1 |
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103-115 |
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Lighting |
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LoNNe @ kagoburian @ |
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639 |
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Stevens, R.G.; Brainard, G.C.; Blask, D.E.; Lockley, S.W.; Motta, M.E. |
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Title |
Adverse health effects of nighttime lighting: comments on American Medical Association policy statement |
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2013 |
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American Journal of Preventive Medicine |
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Am J Prev Med |
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45 |
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3 |
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343-346 |
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American Medical Association; Cell Cycle/physiology; Circadian Rhythm/*physiology; DNA Damage/physiology; *Health Policy; Humans; Lighting/*adverse effects; United States |
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The American Medical Association House of Delegates in June of 2012 adopted a policy statement on nighttime lighting and human health. This major policy statement summarizes the scientific evidence that nighttime electric light can disrupt circadian rhythms in humans and documents the rapidly advancing understanding from basic science of how disruption of circadian rhythmicity affects aspects of physiology with direct links to human health, such as cell cycle regulation, DNA damage response, and metabolism. The human evidence is also accumulating, with the strongest epidemiologic support for a link of circadian disruption from light at night to breast cancer. There are practical implications of the basic and epidemiologic science in the form of advancing lighting technologies that better accommodate human circadian rhythmicity. |
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University of Connecticut Health Center, Farmington, Connecticut 06030-6325, USA. bugs@uchc.edu |
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0749-3797 |
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PMID:23953362 |
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IDA @ john @ |
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130 |
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Kuhn, L.; Johansson, M.; Laike, T.; Goven, T. |
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Residents' perceptions following retrofitting of residential area outdoor lighting with LEDs |
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Journal Article |
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2013 |
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Lighting Research and Technology |
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Lighting Research and Technology |
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45 |
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5 |
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568-584 |
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*Lighting; outdoor lighting; LED; light emitting diode; lighting levels; public opinion |
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The use of light emitting diodes (LEDs) in outdoor lighting has energy-saving potential, but users’ responses to this light source are largely unknown. An intervention study in two residential areas compared conventional lighting installations (high pressure sodium in Area 1 and high pressure mercury in Area 2) to a retrofitted LED-alternative regarding residents’ perceptions of quality of light, visual accessibility and danger. Moreover, energy use was calculated. Residents’ (N = 60) visual accessibility improved and perceived danger remained low in both areas after retrofitting. In Area 2 the perceived quality of light increased, whereas in Area 1 the results were mixed. The retrofitted application reduced energy use by 41–76% and might be a feasible alternative to conventional outdoor lighting in relatively safe areas. |
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Environmental Psychology, Department of Architecture and Built Environment, Lund University, Lund, Sweden |
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1477-1535 |
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IDA @ john @ |
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280 |
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Gil-de-Castro, A.; Moreno-Munoz, A.; Larsson, A.; de la Rosa, J.; Bollen, M. |
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Title |
LED street lighting: A power quality comparison among street light technologies |
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Journal Article |
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Year |
2013 |
Publication |
Lighting Research and Technology |
Abbreviated Journal |
Lighting Research and Technology |
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45 |
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6 |
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710-728 |
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LED; LED lighting; high-pressure sodium; HPS; outdoor lighting; lighting technology |
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High-pressure sodium lamps are currently the main lamps used in public lighting. However, the possibility of using high-power light emitting diode (LEDs) for street lighting is growing continuously due to their greater energy efficiency, robustness, long life and light control. The aim of this paper is to study the power quality of high-power lighting networks based on LED and high-pressure sodium lamps. Both electromagnetic and dimmable electronic ballasts, which can dim the lamp output smoothly and uniformly, have been used connected to high-pressure sodium lamps. High-pressure sodium lamps connected to electronic equipment have been tested with different arc power levels using dimming on a 230 V power supply. The study presented in this paper is completely based on measurements, including harmonic currents in the frequency range up to 150 kHz for all the technologies. The main results show a broadband spectrum in LED lamps which confirms other research in fluorescent lamps powered by high-frequency ballasts. Results also indicate a decrease in the harmonic value with increasing harmonic order, and a decrease in the harmonic value at half load (60%) compared with full load (100%). Although total harmonic distortion of the current is lower with high-pressure sodium lamps connected to electronic rather than electromagnetic ballasts, LED lamps achieved the lowest total harmonic distortion of current. |
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Department of Computer Architecture, Electronics and Electronic Technology, University of Cordoba, Cordoba, Spain |
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1477-1535 |
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IDA @ john @ |
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333 |
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Sweater-Hickcox, K.; Narendran, N.; Bullough, J.; Freyssinier, J. |
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Title |
Effect of different coloured luminous surrounds on LED discomfort glare perception |
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Journal Article |
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Year |
2013 |
Publication |
Lighting Research and Technology |
Abbreviated Journal |
Lighting Research and Technology |
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Volume |
45 |
Issue |
4 |
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464-475 |
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Keywords |
perception; subjective; LED; LED lighting; spectral power distribution; SPD |
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Recently, there has been increased interest in energy-efficient lighting as energy resources become higher in demand. Anecdotal evidence suggests that certain populations believe light-emitting diodes (LED) produce more glare than traditional technologies. This may be due to a number of factors such as spectral power distribution (SPD), source luminance, or beam intensity distribution. A study was conducted to assess the effect of different SPDs on the perception of discomfort glare from an LED source. For the range of conditions evaluated, the presence of any luminous surround significantly reduced the perception of discomfort glare from the LED array. The blue luminous surround reduced discomfort glare perception significantly less than the white or the yellow luminous surrounds. The implications for solid-state lighting systems are discussed. |
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Lighting Research Center, Rensselaer Polytechnic Institute, Troy, NY, USA |
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1477-1535 |
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IDA @ john @ |
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338 |
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