scholarly journals Effects of color in humans generated by led lighting systems

2021 ◽  
pp. 1-12
Author(s):  
Jesús Fausto Córdova-Escobedo ◽  
Felipe Mendoza-González ◽  
Cristian Gomez-Rodriguez ◽  
Jesús Fausto Córdova-Manzo
Keyword(s):  
Health And Safety ◽  
Human Vision ◽  
Color Temperature ◽  
Human Beings ◽  
Lighting System ◽  
Visual Fatigue ◽  
Led Lighting ◽  
Eye Disorders ◽  
Lighting Systems ◽  
Visual Health

This research evaluates the effects of color in humans generated by LED lighting systems. This evaluation allows us to know the different parameters that these systems generate, such as: the temperature and color of light suitable for human vision and thus be able to implement them in LED lighting designs for work areas. Having an adequate lighting system contributes to visual health and safety by avoiding work accidents. Each color has a different percentage of light reflection and in the same way each color affects us optically and psychologically by causing different sensations and perceptions in human beings such as visual fatigue, exhaustion, eye disorders, lacrimation, irritation, stress, migraines and even impaired vision Taking care of visual health is of vital importance. The methodology for evaluating lighting designs will be with NOM-030-ENER-2012. The contribution of this research will be to know the optimal colors and color temperature of light to use in LED lighting systems and to help lighting system designers in the selection of suitable LEDs and area colors that contribute to the visual health of humans

scholarly journals Development and Implementation of a Self-Optimizable Smart Lighting System Based on Learning Context in Classroom

2020 ◽  
Vol 17 (4) ◽  
pp. 1217
Author(s):  
Baoshi Sun ◽  
Qiaoli Zhang ◽  
Shi Cao
Keyword(s):  
Student Performance ◽  
Light Emitting Diode ◽  
Environmental Parameters ◽  
Environmental Data ◽  
Color Temperature ◽  
Lighting System ◽  
Learning Context ◽  
Led Lighting ◽  
Smart Lighting ◽  
Lighting Systems

Illumination is one of the most important environmental factors in the classroom. Researchers have discovered that lighting settings have significant impact on students’ performance. Although light-emitting diode (LED) lighting systems can precisely control brightness level and correlated color temperature (CCT), existing designs of LED lighting control systems for classrooms are focused on energy-saving but lack context-based illumination control ability. In this study, a smart lighting system with continuous evolution capability was developed. It can adjust brightness, CCT, and illuminance distribution dynamically according to specific learning context. This system allows not only manual control, but also automatic switching of scenes by integrating with school schedules. Based on existing knowledge about lighting preference, 10 lighting modes confined in the comfortable zone of Kruithof curve were proposed for various classroom scenarios. Moreover, a classroom environmental data-processing framework for collecting and analyzing learning context, illumination settings, environmental data, and students’ performance data was introduced. This framework can help researchers explore the correlation between student performance and environmental parameters.

scholarly journals Design of a phosphor-converted LED based lighting system considering both the lighting and color uniformity

2021 ◽  
Vol 17 (1) ◽  
Author(s):  
Jinren Yan
Keyword(s):  
Optical Model ◽  
Color Temperature ◽  
Lighting System ◽  
Target Region ◽  
Led Lighting ◽  
Illumination System ◽  
Color Uniformity ◽  
Lighting Systems ◽  
Freeform Lens ◽  
Better Than

AbstractIn this work, a scheme of combining an aspheric reflector and a primary packaging freeform lens in phosphor-converted lighting-emitting diode (pc-LED) based lighting system design was developed. In contrast to most of previous works in which the color and illumination uniformity of the pc-LED lighting systems were improved one by one, the developed scheme can improve both indicators simultaneously. To demonstrate the feasibility of the developed design scheme, an initially designed pc-LED optical model, with an average correlated color temperature (CCT) of about 5000 K, was constructed as the light source of the illumination system. The key ingredient to the color uniformity of the illumination system was investigated at first, and then several instances with the cut-off angle ranging from 40 to 60 degrees were further discussed. Detailed analysis shows: for each case, the CCT variation decreases from over 4000 K to smaller than 300 K and the illumination uniformity increases from a very low level to better than 80% on the target region.

scholarly journals Intelligent LED Lighting System

2018 ◽  
Vol 61 (5) ◽  
pp. 440-450
Author(s):  
I. I. Maronchuk ◽  
I. V. Shirokov ◽  
A. A. Velchenko ◽  
V. I. Mironchuk
Keyword(s):  
Traffic Safety ◽  
Moving Objects ◽  
Time Of Day ◽  
Motion Sensor ◽  
Motion Sensors ◽  
Lighting System ◽  
Coverage Area ◽  
Led Lighting ◽  
Lighting Systems ◽  
Led Luminaire

The article presents the development of an intelligent control system for LED lighting, applicable to autonomous electric lighting installations, outdoor lighting fixtures on posts to illuminate highways, roads, streets and surrounding areas. The system combines all local lighting systems in which the motion sensor and the LED luminaire are integrated into one network. Turning on the LED luminaire at reduced power is carried out automatically when the level of external natural light is less than a certain threshold value. In the case of appearance of an object moving along the motion sensors of neighboring local lighting systems, the speed and direction of movement of the object are determined. In accordance to the speed and direction of the object movement the number of local lighting systems is determined whose LED lamps should be switched on at a higher power and the appearance of the object at the next design point is predicted. The increase in the power of LED lamps is carried out smoothly when the object is approaching the corresponding local lighting system. Due to the dynamic control of the power of the LED luminaires, as moving objects appear in the coverage area of the intelligent lighting system, significant energy savings are achieved. Traffic safety conditions are increased, as the number of LED lamps operating with increased power is determined by the speed of the object, and its possible braking distance will be significantly less than the illuminated section of the roadway. Smooth changes in the power of LED lamps reduce the pressure on the driver of the vehicle. The choice of the motion sensor based on the autodyne radio blocking, which detects moving objects in a given sector of the controlled space, regardless of the time of day and weather conditions, is grounded.

scholarly journals A Multi-Analytical Approach for Studying the Effect of New LED Lighting Systems on Modern Paints: Chemical Stability Investigations

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4441
Author(s):  
Valentina Pintus ◽  
Ferenc Szabó ◽  
Dávid Noel Tóth ◽  
Karin Wieland ◽  
Péter Csuti ◽  
...  
Keyword(s):  
Chemical Stability ◽  
Light Emitting Diode ◽  
Linseed Oil ◽  
Principal Component ◽  
Gas Chromatography Mass Spectrometry ◽  
Halogen Lamp ◽  
Lighting System ◽  
Pyrolysis Gas ◽  
Led Lighting ◽  
Lighting Systems

This study aims to investigate the chemical stability of some modern paint samples exposed to a new Light Emitting Diode (LED)-lighting system and a halogen lamp by using micro-attenuated total reflectance of Fourier transform infrared spectroscopy (µ-ATR-FTIR), µ-Raman, pyrolysis—gas chromatography/mass spectrometry (Py-GC/MS), and thermally assisted hydrolysis and methylation of GC/MS (THM-GC/MS). Those investigations were performed before and after the exposure of the samples to lightings for 1250, 2400, 3300, and 5000 h. The results obtained with µ-Raman spectroscopy show the high stability of the selected inorganic pigments after the exposure to the lighting systems; while similar to the UV/Vis/NIR results reported in a previous study, µ-ATR-FTIR and THM-GC/MS results evidence greater chemical changes occurring principally on the linseed oil binder-based mock-ups among the acrylic and alkyd-based samples. Moreover, principal component analyses (PCA) and hierarchical cluster analyses (HCA) of THM-GC/MS results highlight that those changes were mostly dependent on the exposure time and on the type of pigment, while being independent of the lighting system used. Finally, semi-quantitative µ-ATR-FTIR results show slight pigment enrichment at the paint surface due to the auto and photo-oxidative degradation of the linseed oil binder.

Design and Research of LED Intelligent Lighting System

2014 ◽  
Vol 610 ◽  
pp. 519-522
Author(s):  
Xiang Rong Li ◽  
Hai Peng Wang ◽  
Guo Shuai Li
Keyword(s):  
Lighting System ◽  
Infrared Sensors ◽  
Led Lighting ◽  
Infrared Sensing ◽  
Sensing Technology ◽  
Lighting Systems ◽  
Led Headlamp ◽  
Led Lights ◽  
Presence Of People ◽  
High Application

In order to intelligentize the LED lighting systems,this system adopts the Freescale series MC9S08AC16 as the controller, senses the light environment induced by the photoresistor and uses the SS-101 pyroelectric infrared sensors to sense the presence of people. In addition, it uses LM3404 chip to drive LED headlamp unit and by changing the duty cycle of PWM to achieve the switches and automatic adjustment of brightness of LED lights. Experiments show that the light source brightness provided by this system is stable and reliable and the combination of infrared sensing technology and PWM technology achieves the intelligence of LED lights. Moreover, it has high application value.

Implementation of smartphone-based color temperature and wavelength control LED lighting system

2016 ◽  
Vol 19 (2) ◽  
pp. 949-966 ◽  
Author(s):  
Seung-Mi Moon ◽  
Sook-Youn Kwon ◽  
Jae-Hyun Lim
Keyword(s):  
Color Temperature ◽  
Lighting System ◽  
Led Lighting ◽  
Wavelength Control

Energy Saving Analysis of Solar-Powered LED Street Lighting Systems

2012 ◽  
Vol 490-495 ◽  
pp. 2254-2258
Author(s):  
Li Lin Zang ◽  
Shuo Li ◽  
Da Jun Tian
Keyword(s):  
Energy Saving ◽  
Light Emitting Diode ◽  
Cost Comparison ◽  
Lighting System ◽  
Street Lighting ◽  
Led Lighting ◽  
Lighting Systems ◽  
Solar Powered ◽  
Saving Effect ◽  
The Cost

The light emitting diode (LED) street lighting systems based on solar photovoltaic technology have been used for some time. In this paper, we present an analysis aiming at assessing the feasibility and economic performance of a solar-powered street lighting system for a 1km road. The present study introduces the architecture of a classical solar-powered LED street lighting system and estimates the total investment cost for a 1 km highway with 2 lanes. The cost comparison of solar-powered LED lighting and sodium lamps using grid was carried out. The calculations show that the energy saving effect of solar-powered LED lighting systems is obvious but the initial investment of solar-powered LED systems is more than sodium lighting systems using grid. The investment cycle is about 2.2 years under the current conditions.

Energy-Saving Led Lighting System With Parallel Power Supply By Photovoltaic Modules And By Network

2020 ◽  
pp. 36-40
Author(s):  
Pavel V. Tikhonov
Keyword(s):  
Power Systems ◽  
Power Supply ◽  
Optimal Solution ◽  
Parallel Operation ◽  
Lighting System ◽  
Led Lighting ◽  
Photovoltaic Modules ◽  
Point Tracking ◽  
Lighting Systems ◽  
Power Point

The current state of LED lighting systems with parallel power supply by photovoltaic modules and central power supply network is analysed. The approach to implementation of parallel operation of LED luminaire powered by two sources of power is presented. It is simple, cheap and highly reliable as compared to the existing solutions. Based on this approach, four diagrams are developed which are applicable correspondingly to lighting applications and characteristics of photovoltaic modules and power consumers. The first and the second diagrams contain minimal quantity of transformers, but a number of operational constraints shall be taken into account when using them. The third diagram contains standard transformers and implies minimal number of various constraints, which makes it an optimal solution for the low-power lighting system being designed. The fourth diagram is expensive due to utilisation of equipment with automatic maximum power point tracking (the MPPT technology); it provides maximum possible energy efficiency of the lighting systems but the advantages of the MPPT technology apply only to high-power systems. It is preferable to use such objects where lighting is mostly required during daytime as consumers of such systems (shopping malls, underground passages, storage facilities, poultry farms, etc.). A positive aspect is increase in reliability of consumer power supply since power supply of LED luminaires will be also provided by an additional source. The proposed approach leads to reduction of power consumption for LED lighting, saving of fossil energy sources and therefore to ecologisation of the environment.

Development of an LED Lighting System Through Evaluation of Legibility and Visual Fatigue

2020 ◽  
pp. 229-240
Author(s):  
Keiichi Muramatsu ◽  
Keiichi Watanuki ◽  
Naoya Mashiko ◽  
Yoichiro Watanabe ◽  
Masutsugu Tasaki
Keyword(s):  
Lighting System ◽  
Visual Fatigue ◽  
Led Lighting

Design of Intelligent LED Lighting System Based on KNX Bus for Building

2015 ◽  
Vol 734 ◽  
pp. 960-964 ◽  
Author(s):  
Dang Feng Pang ◽  
Sheng Li Lu ◽  
Feng Xin Zhang ◽  
Guang Zhao
Keyword(s):  
Energy Efficient ◽  
Standard Protocol ◽  
Lighting System ◽  
Residential Areas ◽  
Building Control ◽  
Led Lighting ◽  
Efficient Management ◽  
Open Standard ◽  
Lighting Systems

Technology of KNX bus is an open standard protocol which is used in residential areas and building control worldwide.A kind of intelligent LED lighting system based on KNX bus is designed which realized intelligent controlling for LED lighting systems in office region,energy efficient management and utilization, improvement on scalability and stability.

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