scholarly journals Low-Glare Freeform-Surfaced Street Light Luminaire Optimization to Meet Enhanced Road Lighting Standards

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Jetter Lee ◽  
Lanh-Thanh Le ◽  
Hien-Thanh Le ◽  
Hsing-Yuan Liao ◽  
Guan-Zhi Huang ◽  
...  
Keyword(s):  
Surface Brightness ◽  
International Standards ◽  
Driving Safety ◽  
Street Lighting ◽  
Minimum Requirement ◽  
Road Lighting ◽  
Metal Halide Lamp ◽  
Lighting Simulation ◽  
Simulation Results ◽  
Maximum Limit

To enhance driving safety at night, a new freeform-surface street light luminaire was proposed and evaluated in this study that meets the requirements of the International Commission on Illumination (CIE) M3 class standard for road lighting. The luminaire was designed using simulations to optimize the location of the bulb according to the requirements of the standard. The light source IES file was experimentally obtained for the optimized luminaire prototype with a 150 W ceramic metal halide lamp using an imaging goniophotometer. The trial road lighting simulation results computed by the lighting software DIALux indicated that the proposed luminaire provided an average road surface brightness of 1.1 cd/m2 (compared to a minimum requirement of 1.0 cd/m2), a brightness uniformity of 0.41 (compared to a minimum requirement of 0.4), a longitudinal brightness uniformity of 0.64 (compared to a minimum requirement of 0.6), and a glare factor of 7.6% (compared to a maximum limit of 15%). The findings of the image goniophotometer tests were then confirmed by the results of a certified mirror goniophotometer test conducted by the Taiwan Accreditation Foundation (TAF). The results of this study can be used to provide improved street lighting designs to meet enhanced international standards.

scholarly journals Design of Counter Beam Tunnel Lights for CIE 88 : 2004 Regulation in Threshold Zone

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Ming-Jui Chen ◽  
Hien-Thanh Le ◽  
Lanh-Thanh Le ◽  
Wei-Hsiung Tseng ◽  
Wei-Yang Lee ◽  
...  
Keyword(s):  
Surface Brightness ◽  
Maximum Level ◽  
Road Surface ◽  
Driving Safety ◽  
Minimum Level ◽  
Road Tunnel ◽  
Source File ◽  
Road Lighting ◽  
Dimensional Simulation ◽  
Beam Tunnel

To enhance driving safety, a counter beam light is proposed to meet CIE (International Commission on Illumination) specifications for tunnel lighting. The proposed new counter beam light (CBL) acts as a qualified counter beam light to help tunnel road lighting meet the CIE 88 : 2004 regulation standard in the threshold zone in both simulation and in practice. Through appropriate arrangements of the counter beam light and conventional fluorescent lights on the tunnel ceiling, we demonstrate that road tunnel lighting meeting CIE 88 : 2004 standards can be accomplished. Based on LiteStar four-dimensional simulation, the source file created through the measurement of the proposed CBL prototype achieved an average road surface brightness of 121 cd/m2, which is greater than the minimum regulation level of 105 cd/m2, a brightness uniformity of 0.88 (minimum regulation level of 0.4), longitudinal brightness uniformity of 0.98 (minimum regulation level of 0.6), a glare factor of 4.41% (maximum level of 15%), and a contrast revealing coefficient of 1.08, which is above the 0.6 minimum level in the threshold zone.

Design of Solar-Powered LED Road Lighting System

2019 ◽  
pp. 75-85
Author(s):  
Canan Perdahci ◽  
Hamdi Ozkan
Keyword(s):  
High Pressure ◽  
Renewable Energy Sources ◽  
Junction Temperature ◽  
Mercury Vapour ◽  
Light Sources ◽  
Street Lighting ◽  
Led Light ◽  
Road Lighting ◽  
Lighting Systems ◽  
High Pressure Sodium Lamp

Turkey is rich in terms of renewable energy sources and, therefore, is now encouraging the use of sustainable clean lighting systems in road applications. High pressure sodium lamp is the most widely used type in main roads, but other types of lamps such as mercury vapour lamps or metal halide lamps can be utilized for street lighting. Since it enables energy and money saving, LED light technology has replaced high pressure sodium lamps nowadays. Once solar power system (PV) is integrated with LED lamp for street lighting, the amount of saving and local impact might be enriched. LEDs used as light sources in road lighting luminaires with rising lumen values, decreasing junction temperature, higher colour rendering efficiency, longer lifetime have become more efficient than many light sources with the latest developments. Since the structure of the luminaires in which the LED light sources are used differs from that of the conventional light sources, the optical, thermal and electrical design of the LED luminaires must be considered differently. Thus, this study concentrates upon design considerations and the operating principle of solarpowered LED road lighting luminaire in details. Also, a simple solar panel system was designed and the economical values obtained at the end of 20 years were compared when using the ongrid system and the off-grid system.

scholarly journals Maintenance Factor Identification in Outdoor Lighting Installations Using Simulation and Optimization Techniques

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 2169 ◽  
Author(s):  
Ana Ogando-Martínez ◽  
Javier López-Gómez ◽  
Lara Febrero-Garrido
Keyword(s):  
Modeling And Simulation ◽  
Open Source ◽  
Optimization Techniques ◽  
Lighting System ◽  
Street Lighting ◽  
Optimization Program ◽  
Simulation And Optimization ◽  
The Road ◽  
Road Lighting ◽  
Combined Use

This document addresses the development of a novel methodology to identify the actual maintenance factor of the luminaires of an outdoor lighting installation in order to assess their lighting performance. The method is based on the combined use of Radiance, a free and open-source tool, for the modeling and simulation of lighting scenes, and GenOpt, a generic optimization program, for the calibration of the model. The application of this methodology allows the quantification of the deterioration of the road lighting system and the identification of luminaires that show irregularities in their operation. Values lower than 9% for the error confirm that this research can contribute to the management of street lighting by assessing real road conditions.

China's Streets Lighting Environment Impact Factors Analysis

2013 ◽  
Vol 409-410 ◽  
pp. 1036-1039
Author(s):  
Xiao Ming Su ◽  
Ming Yu Zhang ◽  
Zhan Guo Hao
Keyword(s):  
Surface Brightness ◽  
Impact Factors ◽  
Environment Impact ◽  
Street Lighting ◽  
Surface Conditions ◽  
Factors Analysis ◽  
Lighting Environment ◽  
High Level ◽  
The Relationship

This paper proposed a new method of describing street glare. Glare is a typical light environment, it is affected by streetlights and street surface conditions. It impact on street safety. This paper based on survey of Tianjin, Changsha, Zhengzhou street area, included optical lights types, height of light bulbs, distance between tow lights, street surface brightness, illumination and other factors examination and record. Survey date had been used to set 36 street lighting simulated models and compare with the calculation. The output for the analysis is a series of maps reflecting the relationship between street glare environment and its factors. The case study proved that street lighting environment is closely associated with streetlights bulbs brightness and its installation site. The results show that high level of light brightness will lead to high level of glare and higher light bulbs will increase glare.

Study on Alcohol Testing Modeling and Design of Trusted Driving Safety Control System Based on IOT

2014 ◽  
Vol 590 ◽  
pp. 741-745
Author(s):  
Peng Wang ◽  
Yue Jiang ◽  
Xu Chuan Zhou ◽  
Hao Yang
Keyword(s):  
Control System ◽  
Internet Of Things ◽  
Model Solution ◽  
Driving Safety ◽  
The Internet ◽  
Alcohol Content ◽  
Safety Control ◽  
Simulation Results ◽  
Alcohol Testing ◽  
The Internet Of Things

The Internet of Things (IOT) provides people with a more integrated and intelligent services. The applications based IOT is focus on the solution driving safety in the paper. The design of driving safety control system based on the IOT is proposed and the topology of the system is given. Meanwhile, the alcohol content testing modeling of human blood after drinking is established using the simple differential equations sets. Meanwhile, the model is established and the model solution is given. In the end, MATLAB fitting curves of alcohol content in the blood is proposed and the simulation results showed whether measures are taken after driving, such driving permitted. it shows deeply intelligent driving safety control system can provide mankind with the better services of personal security.

scholarly journals Energy-saving quality road lighting with colloidal quantum dot nanophosphors

Nanophotonics ◽  
2014 ◽  
Vol 3 (6) ◽  
pp. 373-381 ◽  
Author(s):  
Talha Erdem ◽  
Yusuf Kelestemur ◽  
Zeliha Soran-Erdem ◽  
Yun Ji ◽  
Hilmi Volkan Demir
Keyword(s):  
Energy Saving ◽  
Light Sources ◽  
Experimental Proof ◽  
Street Lighting ◽  
Light Emitting ◽  
The Road ◽  
Road Lighting ◽  
The Usa ◽  
The Uk ◽  
Conversion Efficiencies

AbstractHere the first photometric study of road-lighting white light-emitting diodes (WLEDs) integrated with semiconductor colloidal quantum dots (QDs) is reported enabling higher luminance than conventional light sources, specifically in mesopic vision regimes essential to street lighting. Investigating over 100 million designs uncovers that quality road-lighting QD-WLEDs, with a color quality scale and color rendering index ≥85, enables 13–35% higher mesopic luminance than the sources commonly used in street lighting. Furthermore, these QD-WLEDs were shown to be electrically more efficient than conventional sources with power conversion efficiencies ≥16–29%. Considering this fact, an experimental proof-of-concept QD-WLED was demonstrated, which is the first account of QD based color conversion custom designed for street lighting applications. The obtained white LED achieved the targeted mesopic luminance levels in accordance with the road lighting standards of the USA and the UK. These results indicate that road-lighting QD-WLEDs are strongly promising for energy-saving quality road lighting.

scholarly journals Measuring Average Luminance for Road Lighting from Outside the Carriageway with Imaging Sensor

2021 ◽  
Vol 13 (16) ◽  
pp. 9029
Author(s):  
Alexandru Viorel Rusu ◽  
Catalin Daniel Galatanu ◽  
Gheorghe Livint ◽  
Dorin Dumitru Lucache
Keyword(s):  
Digital Camera ◽  
Field Measurements ◽  
Correction Function ◽  
Street Lighting ◽  
Luminance Distribution ◽  
Road Lighting ◽  
Traffic Area ◽  
Average Luminance ◽  
Imaging Sensors ◽  
Imaging Sensor

The main quality condition in street lighting is luminance distribution. During the carrying out of the literature, average luminance is the most important parameter to check. The standard BS EN 13201-3 imposes that average luminance must be calculated for the observer placed in the center of each circulating lane. As a consequence, according to these standards, the measurements can be done only on streets without traffic. Stopping the traffic on all lanes is very difficult. This paper proposes a solution for measuring the average luminance from outside the carriageway. The research was performed by simulations/calculations and was validated by field measurements. Imaging sensors were used to measure average luminance, while DIALux EVO 9.1 was used for the simulations. For symmetrical, opposite, and staggered lighting arrangements, average luminance measurements were performed with a digital camera positioned outside of the traffic area, with the equipment placed at the edge of the carriageway, giving similar results with standard measurements, with almost no difference. For single sided lighting arrangements, the differences became unacceptable. In this case, the paper proposes a correction function to calculate the average luminance for the observer placed on the carriageway, based on measurements with a digital camera placed outside the traffic area.

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