Effect of Correlated Color Temperature and S/P-ratio of LED Light Sources on Reaction Time in Off-axis Vision and Mesopic Lighting Levels

2021 ◽  
pp. 1-12
Author(s):  
E. G. Vicente ◽  
B. M. Matesanz ◽  
M. Rodríguez-Rosa ◽  
A. M. Sáez ◽  
S. Mar ◽  
...  
Keyword(s):  
Reaction Time ◽  
Color Temperature ◽  
Light Sources ◽  
Led Light

scholarly journals An Efficient Method for LED Light Sources Characterization

Electronics ◽  
2019 ◽  
Vol 8 (10) ◽  
pp. 1089 ◽  
Author(s):  
Sara Raggiunto ◽  
Alberto Belli ◽  
Lorenzo Palma ◽  
Piergiovanni Ceregioli ◽  
Massimo Gattari ◽  
...  
Keyword(s):  
Efficient Method ◽  
Least Squares Method ◽  
Color Temperature ◽  
Experimental Setup ◽  
Light Sources ◽  
Careful Study ◽  
Source Characterization ◽  
Led Light ◽  
Lighting Systems ◽  
Led Drivers

Digital LED drivers capable of blending the spectrum of two LED fixtures with different Correlated Color Temperatures through the LEDs’ power supply control are widespread. However, the digital control of lighting systems is possible only after a careful study of the LED’s response, in terms of illuminance and Correlated Color Temperature. The proposed work takes advantage of the Tunable White technology for the realization of an efficient method for LED light source characterization. In order to evaluate how the light changes as a function of the electric power supplied by the LED drivers, an experimental setup to characterize LED light sources has been designed. Starting from the data acquired from the experimental setup, a model for dimming the LED driver and obtaining the desired values of quality of light has been developed. The proposed model is based on the least squares method and its accuracy is evaluated by comparing the obtained values of illuminance and Correlated Color Temperature with those measured by an illuminance spectrophotometer. Results achieved an error of 0.3% for Correlated Color Temperature and 1.5% for illuminance using the proposed approximation functions.

Optimization Algorithm of Correlated Color Temperature for LED Light Sources by Dichotomy

2009 ◽  
Vol 29 (10) ◽  
pp. 2791-2794 ◽  
Author(s):  
林岳 Lin Yue ◽  
叶烈武 Ye Liewu ◽  
刘文杰 Liu Wenjie ◽  
吕毅军 Lü Yijun
Keyword(s):  
Optimization Algorithm ◽  
Color Temperature ◽  
Light Sources ◽  
Led Light

The mesopic effect of different correlated color temperature LED light sources on road lighting

2010 ◽  
Author(s):  
Xuan Li ◽  
Shangzhong Jin ◽  
Yanhua Wang ◽  
Songyuan Cen ◽  
Pei Liang ◽  
...  
Keyword(s):  
Color Temperature ◽  
Light Sources ◽  
Led Light ◽  
Road Lighting

The mesopic effect of different correlated color temperature LED light sources on road lighting

2010 ◽  
Author(s):  
Xuan Li ◽  
Shangzhong Jin ◽  
Yanhua Wang ◽  
Songyuan Cen ◽  
Pei Liang ◽  
...  
Keyword(s):  
Color Temperature ◽  
Light Sources ◽  
Led Light ◽  
Road Lighting

The mesopic effect of different color temperature LED light sources on road lighting

2010 ◽  
Author(s):  
Li Xuan ◽  
Shangzhong Jin ◽  
Songyuan Cen ◽  
Le Wang ◽  
Xiaoyan Li
Keyword(s):  
Color Temperature ◽  
Light Sources ◽  
Led Light ◽  
Road Lighting ◽  
Different Color

Research on Visual Performance under Different Lighting Environments of LED Light Sources

2015 ◽  
Vol 731 ◽  
pp. 92-96
Author(s):  
Yu Liu ◽  
Hong Tao Miao ◽  
Min Huang ◽  
Ai Ping Liu ◽  
Xian Yao Wu
Keyword(s):  
Light Source ◽  
Visual Task ◽  
Visual Performance ◽  
Color Temperature ◽  
Light Sources ◽  
Physiological Changes ◽  
Led Light ◽  
Low Illumination ◽  
Different Color ◽  
The Relationship

In order to study the LED light source illumination and the correlated color temperature effect on the human eye visual performance and physiological changes, through the comparative experiments of visual task performances under the different color temperature (3000K low color temperature, 4000K intermediate color temperature) and the different illumination (1145lux high intensity, 500lux middle intensity, 288lux low illumination), study the relationship between the biological effect and visual performance from two aspects of the visual perception performance and the physical efficiency such as blood pressure and pulse. Research indicates that color temperature 3000K or 4000K, intensity of illumination in about 500lux LED light source is suitable to visual task.

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.

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