| Records |
| Author |
Ho, C.Y.; Lin, H.T.; Huang, K.Y. |
| Title |
A Study on Energy Saving and Light Pollution of LED Advertising Signs |
Type |
Journal Article |
| Year |
2011 |
Publication  |
Applied Mechanics and Materials |
Abbreviated Journal |
Amm |
| Volume |
121-126 |
Issue |
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Pages |
2979-2984 |
| Keywords |
Advertising Sign; LED; Light Trespass; Luminance Limit; Saving Energy; Vertical Illuminance; *Lighting |
| Abstract |
Lighting advertising signs not only play an important role in outdoor lighting environment in Taiwan, but also become the main factor of energy consumption in urban areas at night. Light-emitting diode (LED) has been gradually used in advertising signs due to its advantages. However, in order to be conspicuous and legible in the daytime, signs that are excessively bright may result in considerable light pollution and energy waste at nighttime. Therefore, this research aims to measure the luminance of LED signs and traditional internally lighted signs, and analyze the light trespass from each signage. Based on the research results, the energy consumption from a LED full color screen is 12 times more than a traditional internally lighted sign per day. Statistically, all kinds of LED signs are much higher than traditional internally lighted signs in the percentage of excessive brightness and average luminance value. As for the light trespass, since the vertical illuminance on facade facing the signs increases with the increase of the sign area or the decrease of the distance between the sign and the facade, the vertical illuminance on facade facing the signs would exceed the limit of CIE even if the luminance of the signs achieves the standard of CIE in terms of the general conditions in Taiwan. This happens to LED full color screens in particular and thus results in considerable obtrusive light. To sum up, in order to reduce unnecessary energy consumption and improve the nighttime lighting quality for outdoor environment, this research recommends the luminance limitation for light dimming of LED advertising signs should refer to the zoning, time period, and sign area. |
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| ISSN |
1662-7482 |
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no |
| Call Number |
IDA @ john @ |
Serial |
126 |
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| Author |
Zukauskas, A.; Vaicekauskas, R.; Vitta, P. |
| Title |
Optimization of solid-state lamps for photobiologically friendly mesopic lighting |
Type |
Journal Article |
| Year |
2012 |
Publication |
Applied Optics |
Abbreviated Journal |
Appl Opt |
| Volume |
51 |
Issue |
35 |
Pages |
8423-8432 |
| Keywords |
Lighting Systems; Circadian Rhythm; Color; Equipment Design; Humans; Light; *Lighting; Melatonin/metabolism; Photobiology/*methods; Semiconductors; Time Factors; Vision, Ocular |
| Abstract |
The circadian and visual-performance-based mesopic systems of photometry were applied for the optimization of the spectral power distributions (SPDs) of the solid-state sources of light for low-illuminance lighting applications. At mesopic adaptation luminances typical of outdoor lighting (0.1-2 cd/m(2)), the optimal SPDs were obtained through the minimization of the mesopic circadian action factor, which is the ratio of the circadian efficacy of radiation to mesopic luminous efficacy of radiation. For correlated color temperatures below ~3000 K, the optimized dichromatic light-emitting diodes (LEDs) are shown to pose a lower circadian hazard than high-pressure sodium lamps and common warm white LEDs; also they are potentially more efficacious and have acceptable color rendition properties under mesopic conditions. |
| Address |
Institute of Applied Research, Vilnius University, Sauletekio al. 9-III, Vilnius LT-10222, Lithuania. arturas.zukauskas@ff.vu.lt |
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English |
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| ISSN |
0003-6935 |
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| Notes |
PMID:23262538 |
Approved |
no |
| Call Number |
LoNNe @ christopher.kyba @ |
Serial |
448 |
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| Author |
Babadi, S.; Ramirez-Inguiez, R.; Boutaleb, T.; Mallick, T. |
| Title |
Producing uniform illumination within a rectangular area by using a nonimaging optic |
Type |
Journal Article |
| Year |
2018 |
Publication |
Applied Optics |
Abbreviated Journal |
Appl. Opt. |
| Volume |
57 |
Issue |
31 |
Pages |
9357 |
| Keywords |
Lighting |
| Abstract |
This paper proposes a new design method to create a novel optical element to generate uniform illumination within a rectangular area. Based on this model, an illuminated area is irradiated by two sets of rays; the first one irradiates the target plane after refraction from the top section of the lens, and the second one irradiates from the reflection at the side profile of the lens and then from refraction at the top part of the lens. The results show that a uniformity of over 90% can be achieved. |
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| ISSN |
1559-128X |
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Approved |
no |
| Call Number |
GFZ @ kyba @ |
Serial |
2046 |
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| Author |
Yao, Q.; Wang, H.; Uttley, J.; Zhuang, X. |
| Title |
Illuminance Reconstruction of Road Lighting in Urban Areas for Efficient and Healthy Lighting Performance Evaluation |
Type |
Journal Article |
| Year |
2018 |
Publication |
Applied Sciences |
Abbreviated Journal |
Applied Sciences |
| Volume |
8 |
Issue |
9 |
Pages |
1646 |
| Keywords |
Instrumentation; Lighting; Planning |
| Abstract |
Big lighting data are required for evaluation of lighting performance and impacts on human beings, environment, and ecology for smart urban lighting. However, traditional approaches of measuring road lighting cannot achieve this aim. We propose a rule-of-thumb model approach based on some feature points to reconstruct road lighting in urban areas. We validated the reconstructed illuminance with both software simulated and real road lighting scenes, and the average error is between 6 and 19%. This precision is acceptable in practical applications. Using this approach, we reconstructed the illuminance of three real road lighting environments in a block and further estimated the mesopic luminance and melanopic illuminance performance. In the future, by virtue of Geographic Information System technology, the approach may provide big lighting data for evaluation and analysis, and help build smarter urban lighting. |
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| ISSN |
2076-3417 |
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no |
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GFZ @ kyba @ |
Serial |
2003 |
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| Author |
Riley, W.D.; Bendall, B.; Ives, M.J.; Edmonds, N.J.; Maxwell, D.L. |
| Title |
Street lighting disrupts the diel migratory pattern of wild Atlantic salmon, Salmo salar L., smolts leaving their natal stream |
Type |
Journal Article |
| Year |
2012 |
Publication |
Aquaculture |
Abbreviated Journal |
Aquaculture |
| Volume |
330-333 |
Issue |
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Pages |
74-81 |
| Keywords |
Artificial light; Behaviour; Migration; Salmon; Smolt; Street lighting |
| Abstract |
The migratory timing and behaviour of wild Atlantic salmon smolts leaving their natal stream was determined using a passive integrated transponder (PIT) antennae system at a study site on a tributary of the River Itchen, England. Experiments compared the downstream migration of smolts under natural control conditions (2000–2006) with two years (2008 and 2009) when the main downstream exit of the study site was subject to street-lit conditions every alternate night (maximum light intensity measured at the stream surface = 14 lx). Migration of smolts under control conditions was significantly (p < 0.01, n = 170) correlated with sunset. By contrast, street lighting resulted in the timing of migration being random (p = 0.11, n = 7; p = 0.76, n = 34, respectively) with respect to time of day. Furthermore, migration of smolts was significantly (p = 0.01, n = 19) correlated with the time of sunset for fish migrating when the lamp had been off, but random (p = 0.36, n = 22) when the lamp had been on (2008 and 2009 data, combined). This alteration in migratory behaviour due to street lighting may impact fitness. |
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| ISSN |
0044-8486 |
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no |
| Call Number |
IDA @ john @ |
Serial |
69 |
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