Performance of induction lamps and HPS lamps in road tunnel lighting

Chen, Wen‐Cheng; Zheng, Huang; Guo, Liping; Lin, Yandan; Chen, Dahua

doi:10.1016/j.tust.2007.03.003

Cited by 10 publications

(6 citation statements)

References 3 publications

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“…Their lighting installations, which work 24 h per day throughout the year, result in most of the energy consumption [5][6][7]. Surveys show that lighting consumes 30% of the energy consumed by the mechanical and electrical systems in high tunnels [8]. Therefore, it is imperative to establish an energy-saving tunnel lighting system.…”

Section: Introductionmentioning

confidence: 99%

An “Illumination Moving with the Vehicle” Intelligent Control System of Road Tunnel Lighting

Wang

Cui

Chen³

et al. 2020

Sustainability

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To reduce the enormous waste of electric energy in tunnel lighting, an intelligent control system of road tunnel lighting which can realize the effect of illumination moving with the vehicle is proposed. In this system, the group control of LED lamps is realized based on Air Lamp lighting technology through the wide area fusion Internet of Things (WF-IoT). By the group control of LED lamps, the tunnel lighting is divided into several illumination segments. When the vehicle is detected by the surveillance camera, the corresponding LED group can be adjusted to the demand luminance according to the environmental conditions and traffic information. The other LED groups maintain 10% of the maximum luminance to reduce energy consumption. To realize the effect of illumination moving with the vehicle, the structure of the intelligent control system and hardware system is designed, and the length of the illumination segment is calculated. To evaluate the lighting effect of the intelligent control system, a simulation model of tunnel lighting is established. In addition, the energy-saving effect of the intelligent control system is evaluated. The results show that the intelligent control system can meet the requirements of illumination in a tunnel and have a notable energy-saving effect.

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Section: Introductionmentioning

confidence: 99%

An “Illumination Moving with the Vehicle” Intelligent Control System of Road Tunnel Lighting

Wang

Cui

Chen³

et al. 2020

Sustainability

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“…Several studies consider the impact of sudden changes in light intensity at the entrance and exit of tunnels. 13–15 The pupil diameter increases under the sharp decrease of light intensity, e.g. as a driver enters a tunnel.…”

Section: Introductionmentioning

confidence: 99%

Susceptibility of LED street lamps to voltage dips

Sakar

Bagheri

Rönnberg

et al. 2020

Lighting Research & Technology

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There is an ongoing transition from high-pressure sodium lamps to LED street lamps that offer higher efficiency, cost saving and better photometric performance. This transition could lead to unintended consequences such as light flicker and extinguishing in street lighting applications when they are exposed to voltage dips. The goal of this paper is to analyse the light intensity variation of various street lamps when they are exposed to voltage dips. Several performance metrics for quantifying immunity of lamps have been proposed. Values for these metrics are obtained by applying artificial voltage dips to lamps. For voltage dips with residual voltage above 38%, lamps are immune in terms of a short-term light flicker metric. For residual voltage above 25%, light intensity reduces but without extinguishing. Compared to an incandescent lamp and high-pressure sodium lamp, LED street lamps exhibit longer zero-light intensity duration. Most of the studied LED street lamps exhibit uncoordinated light intensity drops, i.e. longer or shifted, with respect to the applied voltage dip. Individual characteristics of LED street lamps require testing before installation to prevent unexpected consequences. Recommendations are given for standardisation committees to implement an assessment method for lighting equipment.

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“…The aim of tunnel lighting is to allow traffic to enter, pass through and exit the enclosed section safely. This goal implies that drivers drive into the tunnel without reducing their vehicle speed and are able to see unexpected hazards on the carriageway and stop if necessary [15]. During day time, adequate illumination avoids the "black-hole effect" (i.e., a decrease of the drivers' visual perception) while passing from the outside into the tunnel [16,17].…”

Section: Introductionmentioning

confidence: 99%

Italian Road Tunnels: Economic and Environmental Effects of an On-Going Project to Reduce Lighting Consumption

Moretti

Cantisani

Carrarini³

et al. 2019

Sustainability

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Tunnel lighting represents a major cost item for road managers, and particularly in Italy owing to its specific geomorphological and orographic features. In 2018, ANAS, the Italian government-owned road company launched an ambitious program to rehabilitate the lighting systems of more than 700 tunnel tubes across Italy. The Greenlight plan aims to reduce consumption and improve the management of lighting systems while minimizing the impact of works. Outdated high-pressure sodium (HPS) luminaries will be substituted with state-of-the-art light emitting diode (LED) luminaries without modifying the position and the number of the existing luminaires. The project involves an amount of 155 million euros and provides a total return over a less than seven-year period. The first phase of the project involves 147 tubes and is still on-going: 28 GWh (on average 55% of the current consumption) will be saved every year against a 30 million euro investment. More importantly, the economic benefits also have a direct impact on the environment for citizens and safety levels for road users—every year more than 17,000 t of CO2 eq. and 230 TJ from combustion of fossil fuels will be saved. The lighting quality of the artificial lighting inside the tunnel will be enhanced thanks to better uniformity and the color temperature of the luminaries. The experience presented here could be useful since other road managers may pursue a similar approach in order to balance often-conflicting environmental, economic and safety goals.

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Performance of induction lamps and HPS lamps in road tunnel lighting

Cited by 10 publications

References 3 publications

An “Illumination Moving with the Vehicle” Intelligent Control System of Road Tunnel Lighting

An “Illumination Moving with the Vehicle” Intelligent Control System of Road Tunnel Lighting

Susceptibility of LED street lamps to voltage dips

Italian Road Tunnels: Economic and Environmental Effects of an On-Going Project to Reduce Lighting Consumption

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