scholarly journals Model Parameter Identification and Validation for Energy Saving Light Bulbs

2020 ◽  
Vol 19 ◽  
Keyword(s):  
Energy Saving ◽  
Light Emitting Diode ◽  
Electrical Energy ◽  
Frequency Domain Analysis ◽  
Model Parameters ◽  
Light Sources ◽  
Fast Analysis ◽  
Light Emitting ◽  
Fluorescent Lamps ◽  
Harmonic Components

Due to electrical energy reduction need, in the recent years, alternative light sources like Compact Fluorescent Lamps (CFL) and Light Emitting Diode lamps (LED) are replacing the classical incandescent light bulbs. Although they consume less power, these lamps have the disadvantages of being a significant source of harmonics. This means that the lightning network should be redesigned taking into account the magnitude of the current harmonic components and of the null current. To this aim, an accurate model easy to build and a fast analysis are very useful. This paper presents three models for different types of energy saving light bulbs, two existing ones and a new implementation, a procedure for model parameters identification and a comparison of the models. Some errors criteria are considered, both qualitative and quantitative. The periodic steady state response is computed using a frequency domain analysis.

Case Study for Replacement of Conventional Lights by Led Lights

2019 ◽  
Vol 7 ◽  
pp. 44-51
Author(s):  
Indu Duwal
Keyword(s):  
Energy Saving ◽  
Energy Demand ◽  
Light Emitting Diode ◽  
Light Sources ◽  
Demand And Supply ◽  
Light Emitting ◽  
Return Of Investment ◽  
Science Group ◽  
Led Lights

With the increment in the gap between the demand and supply of energy, various alternatives for decreasing the demand of energy are major concern for the various stakeholders. In order to decrease the energy demand by lighting various energy efficient lights are available in market. However it is difficult to convince the residents to change conventional artificial light sources, since lighting system is an essential part in the building which ensures the comfort, productivity and safety of the occupants in the buildings. Among the various Light Emitting Diode (LED) lights are termed as one of the most efficient energy saving lights which aims to save almost more than 50 % of energy demand than that of CFL lights with same power of illumination. Hence, this study is carried out to calculate energy saving percentage after replacing the conventional lights like florescent, mercury lights and other forms of conventional lights by LED lights. Additionally the study also was focused to evaluate feasibility of the replacement of lights by LED lights in terms of energy saving and return of investment. The research was carried out in building used by Agrotechnology and Food Science (AFSG) science group of Wageningen University in the Netherlands. The results from the study showed that almost 50% of the energy can be saved after replacement by LED lights with around 5 years for return of investment. However, factors like 1) Number of operating hours, 2) Price of lights, 3) Energy cost, 4) Labour cost for replacement and adjustment and 5) Number of replacement and adjustment per hour are the influential features that effects in the performance of various types of lights

scholarly journals The Development of LED-Based Dental Light Using a Multiplanar Reflector Design

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
Chi-Chang Hsieh ◽  
Yan-Huei Li
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
High Power ◽  
Light Emitting Diode ◽  
Luminous Flux ◽  
International Standards ◽  
Light Sources ◽  
Light Emitting ◽  
Standards And Regulations ◽  
Reduce Energy Consumption

A multiplanar reflector was designed to enhance the application efficiency of light-emitting diode (LED) light sources that can be employed as LED-based dental lights. This study used a high-power LED developed by Nichia, that is, a single LED capable of providing a total luminous flux of 120 lm, as the primarily light source to design and develop an LED-based dental light. This LED complies with the international standards and regulations stipulated in ISO 9680:2007. The light spots produced by the prototype were rectangular, with a length of 200 mm and a width of 100 mm. These light spots achieved maximum illumination of 12,000 lux. The use of LEDs can reduce energy consumption from 50 W to 3 W, providing an energy saving of more than 90%.

scholarly journals Application of Electric Energy Saving Light Source and Light Emitting Diode in the Landscape of Buildings under Optical Spectroscopy Theory

2021 ◽  
Vol 2083 (2) ◽  
pp. 022104
Author(s):  
Xiaojing Shi
Keyword(s):  
Energy Saving ◽  
Environmental Protection ◽  
Quantitative Research ◽  
Light Emitting Diode ◽  
Electric Energy ◽  
Light Sources ◽  
Light Emitting ◽  
High Rise ◽  
High Rise Building ◽  
Selection Of

Abstract How to reflect energy conservation and environmental protection in the landscape of high-rise buildings is a hot topic of current research. How to use environmentally friendly materials to show the charm of high-rise building landscape is the main content of this article. Based on the colour samples of the high-rise building landscape, the thesis uses environmental protection and energy-saving light sources to simulate the lighting of the building colour samples in the laboratory. This article realizes the quantitative research on the colour authenticity performance of colour paintings under commonly used LEDs in high-rise building landscapes, and provides a reliable basis for the selection of LEDs in colour painting lighting design.

Comparison of Monitor Types in Personal Computer Set on Electrical Energy Saving and Side Effect on Power Quality

2013 ◽  
Vol 313-314 ◽  
pp. 891-895
Author(s):  
C. Uyaisom ◽  
K. Nuntasud ◽  
P. Kerdlap
Keyword(s):  
Energy Saving ◽  
Power Quality ◽  
Personal Computer ◽  
Power Factor ◽  
Side Effect ◽  
Liquid Crystal Display ◽  
Light Emitting Diode ◽  
Electrical Energy ◽  
Light Emitting ◽  
High Level

This paper presets comparisons of type of monitor in personal computer set on electrical energy saving and side effect on power quality. The 3 types of monitor in personal computer consists of cathode ray tube : CRT type inch, liquid crystal display : LCD type, and light emitting diode : LED type and side of each monitor is 19 inch. The experimental results as shown the power consumption and side effect on power quality such as power factor and %THDi each monitor types. The experiment results shown the best effectiveness is LED monitor type, it can be saving of energy up to 75.69 % of CRT monitor type and 45.30 % of PC. Set with CRT monitor type. However, the LED monitor type are generated of %THDi very high level and low level of power factor.

Opportunities and Challenges in Perovskite LEDs Commercialization

2021 ◽  
Author(s):  
Kai Zhang ◽  
Ningning Zhu ◽  
Mingming Zhang ◽  
Lei Wang ◽  
Jun Xing
Keyword(s):  
Energy Saving ◽  
Energy Efficient ◽  
Light Emitting Diode ◽  
Environment Friendly ◽  
Light Emitting ◽  
Lighting Technology

Recently, the light-emitting diode (LED) has been considered as an energy-saving and environment-friendly lighting technology，which is ten times more energy efficient than conventional incandescent lights. As an emerging photoelectric material,...

Electrically driven single microribbon based near-infrared exciton-polariton light-emitting diode

CrystEngComm ◽  
2021 ◽  
Author(s):  
Mingming Jiang ◽  
Fupeng Zhang ◽  
Kai Tang ◽  
Peng Wan ◽  
Caixia Kan
Keyword(s):  
High Performance ◽  
Near Infrared ◽  
Light Emitting Diodes ◽  
Light Emitting Diode ◽  
Light Sources ◽  
Coherent Light ◽  
Light Emitting ◽  
Exciton Polaritons ◽  
Laser Devices

Achieving electrically-driven exciton-polaritons has drawn substantial attention toward developing ultralow-threshold coherent light sources, containing polariton laser devices and high-performance light-emitting diodes (LEDs). In this work, we demonstrate an electrically driven...

Reliability of High-Power Light Emitting Diode Attached With Different Thermal Interface Materials

2010 ◽  
Vol 132 (3) ◽  
Author(s):  
Xin Li ◽  
Xu Chen ◽  
Guo-Quan Lu
Keyword(s):  
High Power ◽  
Heat Dissipation ◽  
Light Emitting Diode ◽  
Temperature Cycling ◽  
Fluorescent Light ◽  
Light Sources ◽  
Light Emitting ◽  
Die Attach ◽  
Nanosilver Paste ◽  
Interconnection Material

As a solid electroluminescent source, white light emitting diode (LED) has entered a practical stage and become an alternative to replace incandescent and fluorescent light sources. However, due to the increasing integration and miniaturization of LED chips, heat flux inside the chip is also increasing, which puts the packaging into the position to meet higher requirements of heat dissipation. In this study, a new interconnection material—nanosilver paste is used for the LED chip packaging to pursue a better optical performance, since high thermal conductivity of this material can help improve the efficiency of heat dissipation for the LED chip. The bonding ability of this new die-attach material is evaluated by their bonding strength. Moreover, high-power LED modules connected with nanosilver paste, Sn3Ag0.5Cu solder, and silver epoxy are aged under hygrothermal aging and temperature cycling tests. The performances of these LED modules are tested at different aging time. The results show that LED modules sintered with nanosilver paste have the best performance and stability.

In-Use Photostability Practice and Regulatory Evaluation for Pharmaceutical Products in an Age of Light-Emitting Diode Light Sources

2019 ◽  
Vol 108 (3) ◽  
pp. 1172-1176 ◽  
Author(s):  
Leonardo R. Allain ◽  
Brittany C. Pierce ◽  
W. Peter Wuelfing ◽  
Allen C. Templeton ◽  
Roy Helmy
Keyword(s):  
Light Emitting Diode ◽  
Pharmaceutical Products ◽  
Light Sources ◽  
Light Emitting ◽  
Regulatory Evaluation

Manufacture and Evaluation of Light Emitting Diode Package Substrate Using Flexible Printed Circuit Board

2015 ◽  
Vol 15 (10) ◽  
pp. 7578-7581
Author(s):  
Jung-Kab Park ◽  
Jin-Ha Shin ◽  
Mun-Gi Jung ◽  
Tomabechi Shigehisa ◽  
Hwa-Sun Park ◽  
...  
Keyword(s):  
Thermal Resistance ◽  
Light Emitting Diode ◽  
Thermal Conductance ◽  
Polyimide Film ◽  
Luminous Efficiency ◽  
Circuit Board ◽  
Light Sources ◽  
Thermal Shock Test ◽  
Light Emitting ◽  
Au Electrode

Unlike other light sources such as fluorescent lamps and incandescent bulbs, light-emitting diodes (LED) convert 70∼80% of energy into heat. If the heat produced an LED chip is not effectively released, its luminous efficiency and lifespan are reduced. Therefore, as a method effectively release heat, an LED PKG substrate containing a heat-releasing material with excellent thermal conductance was fabricated, and its thermal resistance and luminous efficiency were analyzed. In this experiment, a thin polyimide film with excellent ductility was used to fabricate the LED PKG substrate. A 35-μm-thick Cu foil with excellent thermal conductance was subjected to high temperature and pressure and attached to both sides of the polyimide film. By electroplating Ag or Au, which has excellent thermal conductance, for us as the electrode and heat-releasing material, LED PKG substrate was fabricated with a thickness of approximately 170 μm. (−40 °C → RT → 120 °C). The results revealed that the LED PKG substrate having a Ag electrode with excellent thermal conductance had an excellent thermal resistance of approximately 4.2 °C/W (Au electrode: 5.6 °C/W). The luminous flux after 100 cycles in the thermal shock test was reduced by approximately 0.09% (Au electrode: 2.77%), indicating that the LED PKG substrate had excellent thermal resistance without any mechanical and material defects in a rapid-temperature-changing environment. The advantages and excellent thermal resistance can be exploited in cellular phones and LCD panels, and heat-releasing problems in thin panels be solved.

scholarly journals Analysis of Energy and Cost Performance of Retrofitting Fluorescent Tubes with Compact Fluorescent and Light Emitting Diode Lamps

2020 ◽  
pp. 34-46 ◽  
Author(s):  
J. S. Adeleke ◽  
A. B. Wahab ◽  
E. A. Olanipekun
Keyword(s):  
Light Emitting Diode ◽  
Electricity Consumption ◽  
Poor Performance ◽  
Payback Period ◽  
Optimal Performance ◽  
Light Emitting ◽  
Tertiary Institutions ◽  
Fluorescent Lamps ◽  
Significant Difference ◽  
Compact Fluorescent Lamp

Over the years, visual comfort has been described as a major requirement needed to enhance optimal performance of occupants in any learning environment in tertiary institutions. This is reflected in the poor performance of the commonly used Fluorescent Lamps (FL) occasioned by its constant burn-off, high failure rate and reduced durability. Hence, there is a shift to the adoption of Compact Fluorescent Lamp (CFL) and Light Emitting Diode (LED). This study therefore examined the pattern of electricity consumption involving the adoption of FL, CFL and LED in the purposively selected lecture theatres of Obafemi Awolowo University, Ile-Ife, Nigeria. The study was carried out using energy monitor to obtain the consumption data of the lamps for periodic logging at intervals of 1 hr, 3 hrs, 6 hrs, 12 hrs, 1 day, 7 days, 1 month and 3 months respectively; and also to determine the payback period of each of the lamps. From the data collected, patterns of electricity used, electricity savings were calculated and compared to establish performance potentials of each of the lamps. The study found that there was a significant difference in the pattern of electricity consumption of FLs compared with that of CFLs and LEDs, but a reduced margin existed between CFLs and LED lamps. It showed that the FLs consumed 681.576 kWh, 1619.466 kWh and 5652.432 kWh, CFLs consumed 387.302 kWh, 692.479 kWh and 1936.600 kWh, while LED consumed 294.188 kWh, 426.608 kWh and 1499.015 kWh. There were significant differences in consumption with 43, 47 and 65% reduction in electricity consumption using CFLs while 57, 73 and 73% using LED fittings were obtained. The CFLs performed better in terms of return on investments by having a lower payback period when compared to LED. The study concluded that replacing FL with CFL and LED would be desirable option in order to enhance optimal performance of lecture theatres, but in terms of payback period, it would be beneficial to retrofit FLs with CFLs.

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