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Author |
Ho, C.Y.; Lin, H.T.; Huang, K.Y. |
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Title  |
A Study on Energy Saving and Light Pollution of LED Advertising Signs |
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Journal Article |
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Year |
2011 |
Publication |
Applied Mechanics and Materials |
Abbreviated Journal |
Amm |
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121-126 |
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2979-2984 |
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Keywords |
Advertising Sign; LED; Light Trespass; Luminance Limit; Saving Energy; Vertical Illuminance; *Lighting |
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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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1662-7482 |
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IDA @ john @ |
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126 |
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Park, H.-K.; Gu, J.-H.; Lee, K.-M. |
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Title |
A study on selecting of Light Cutoff Panel depending on the installation condition using the lighting simulation |
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Journal Article |
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Year |
2016 |
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Journal of the Korea Academia-Industrial cooperation Society |
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Journal of the Korea Academia-Industrial cooperation Society |
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17 |
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2 |
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246-251 |
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Keywords |
Lighting; Light cutoff panel; Light pollution; Light trespass; Relux; Security light |
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The use of security lighting that emits spill light is considered a cause of light trespass problems in the residential areas. Therefore, a cutoff panel was installed as an alternative way to reduce light trespass. On the other hand, it has another problem in that it is less effective and is not good enough for aesthetics and safety. In this study, a light cutoff panel was designed and manufactured to reduce the light trespass, and the structure of a proper light cutoff panel was studied. Using a goniophotometer, the light distribution file (IES file) was extracted and the characteristics of light distribution were analyzed using the RELUX program. The results showed that the reduction of spilt light in the backward direction was decreased significantly for all types of light cutoff panels except the coated globe. In the case of a black powder coated light cutoff panel, the forward light caused by light reflected from the surface of the light cutoff panel was also reduced, which means that the black powder coated light cutoff panel is effective in the performance of light cutoff in the forward and backward directions. In addition, the coated glove increased the spilt light in the forward and backward directions because it reflects the upward light to go down. A 90 % accuracy between the measurement value of light trespass and the expected value of the light trespass was obtained from a simulation. |
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National Institute of Environmental Research; mossad61(at)korea.kr |
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KoreaScience |
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Korean |
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English |
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1975-4701 |
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IDA @ john @ |
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1448 |
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Gutierrez-Escolar, A.; Castillo-Martinez, A.; Gomez-Pulido, J.; Gutierrez-Martinez, J.-M.; Stapic, Z.; Medina-Merodio, J.-A. |
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A Study to Improve the Quality of Street Lighting in Spain |
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2015 |
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Energies |
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Energies |
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8 |
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2 |
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976-994 |
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Energy; Lighting; Planning; Regulation |
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1996-1073 |
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LoNNe @ christopher.kyba @ |
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1096 |
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Arnold, G.; Mellinger, D.; Markowitz, P.; Burke, M.; Lahar, D. |
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Title |
A Win-Win-Win for Municipal Street Lighting: Converting Two-Thirds of Vermont's Street Lights to LED by 2014. |
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2012 |
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American Council for an Energy-Efficient Economy. |
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Lighting Systems |
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Reducing energy costs and enhancing the nighttime environment with LED street lighting
is by now well understood. However, few municipalities and utilities have successfully taken
advantage of this opportunity to convert their street lighting operations to LEDs. Before a
system-wide conversion of existing street lights can occur, a utility must obtain the large amount
of required capital, identify appropriate LED street light equipment for their applications,
consider changes in utility rate structures, and design effective methods for recovering costs.
Using Vermont as a case study, this paper presents a partnership model among the statewide
energy efficiency utility, the state’s largest electric utilities, and several municipalities. The
model was designed to overcome the challenges to widespread LED street light conversion. By
2014, more than two-thirds of Vermont’s municipal street lights will be upgraded to LED
technology. The conversion will: (1) provide municipalities with better nighttime street lighting
and significant cost savings—at no additional capital expense to the municipalities, (2) deliver
8,000 MWh of cost-effective new savings to the energy efficiency utility, and (3) deliver
financially attractive returns for Vermont’s utilities. This win-win-win model is scalable and
replicable, and is now being considered in Massachusetts and Rhode Island |
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LoNNe @ christopher.kyba @ |
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446 |
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Author |
Pocock, T. |
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Title |
Advanced lighting technology in controlled environment agriculture |
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Journal Article |
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Year |
2016 |
Publication |
Lighting Research and Technology |
Abbreviated Journal |
Lighting Research and Technology |
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48 |
Issue |
1 |
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83-94 |
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Keywords |
Plants; Lighting |
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Abstract |
There is a recent awareness of the importance of plants in our everyday lives. Light is a requirement for plants and serves two important roles. It provides energy for growth and provides information that elicits plant responses including, among others, plant shape, pigmentation, nutritional content and resistance to stress. Light is paradoxical to plants, it is a requirement however, in excess it is damaging. Plants sense and interpret light through many families of photoreceptors and through the energy state of the photosynthetic apparatus. Light emitting diodes (LEDs) are quickly replacing traditional light sources for human applications, and currently there is effort being put into tailoring these technology platforms for the plant community. Potential plant sensing pathways and the spectral effects on pigmentation and photochemistry in red lettuce are described. |
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1477-1535 |
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LoNNe @ kyba @ |
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1383 |
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