scholarly journals Analysis on High-Power Seaport LED Luminaire with Uniform Light Distribution Based on Optimized Lens and Heatsink

2021 ◽  
Vol 11 (9) ◽  
pp. 4035
Author(s):  
Jinsheon Kim ◽  
Jeungmo Kang ◽  
Woojin Jang
Keyword(s):  
Light Source ◽  
High Power ◽  
Heat Dissipation ◽  
Light Emitting Diode ◽  
Light Distribution ◽  
Light Sources ◽  
Led Light ◽  
High Power Led ◽  
Distribution Requirement ◽  
Lighting Application

In the case of light-emitting diode (LED) seaport luminaires, they should be designed in consideration of glare, average illuminance, and overall uniformity. Although it is possible to implement light distribution through auxiliary devices such as reflectors, it means increasing the weight and size of the luminaire, which reduces the feasibility. Considering the special environment of seaport luminaires, which are installed at a height of 30 m or more, it is necessary to reduce the weight of the device, facilitate replacement, and secure a light source with a long life. In this paper, an optimized lens design was investigated to provide uniform light distribution to meet the requirement in the seaport lighting application. Four types of lens were designed and fabricated to verify the uniform light distribution requirement for the seaport lighting application. Using numerical analysis, we optimized the lens that provides the required minimum overall uniformity for the seaport lighting application. A theoretical analysis for the heatsink structure and shape were conducted to reduce the heat from the high-power LED light sources up to 250 W. As a result of these analyses on the heat dissipation characteristics of the high-power LED light source used in the LED seaport luminaire, the heatsink with hexagonal-shape fins shows the best heat dissipation effect. Finally, a prototype LED seaport luminaire with an optimized lens and heat sink was fabricated and tested in a real seaport environment. The light distribution characteristics of this prototype LED seaport luminaire were compared with a commercial high-pressure sodium luminaire and metal halide luminaire.

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.

scholarly journals Lifetime prediction of a multi-chip high-power LED light source based on artificial neural networks

2019 ◽  
Vol 12 ◽  
pp. 361-367 ◽  
Author(s):  
Hongwei Liu ◽  
Dandan Yu ◽  
Pingjuan Niu ◽  
Zanyun Zhang ◽  
Kai Guo ◽  
...  
Keyword(s):  
Neural Networks ◽  
Artificial Neural Networks ◽  
Light Source ◽  
High Power ◽  
Lifetime Prediction ◽  
Led Light ◽  
High Power Led ◽  
Artificial Neural

scholarly journals Investigation on optical integration between LED Mid-IR light sources and Si-based waveguides for sensing applications

2021 ◽  
Vol 2145 (1) ◽  
pp. 012056
Author(s):  
Pawaphat Jaturaphagorn ◽  
Papichaya Chaisakul ◽  
Nattaporn Chattham ◽  
Pichet Limsuwan
Keyword(s):  
Integrated Circuits ◽  
Light Source ◽  
Light Emitting Diode ◽  
Coupling Scheme ◽  
Light Sources ◽  
Optical Coupling ◽  
Led Light ◽  
Carbon Dioxide Gas ◽  
Sensing Applications ◽  
Ir Light

Abstract Research on mid-IR silicon-based waveguides has recently received strong interest. Particularly, this paper focuses on one of the critical issues in micron-scale photonic integrated circuits, which is to efficiently couple a mid-IR LED (light emitting diode) light source to an external micron-scale waveguide. The optical coupling scheme is crucial for the exploitation of LED light sources in waveguide-based spectroscopic sensing applications. This paper reports optical coupling scheme between an LED mid-IR light source and a silicon rich silicon nitride (SiN) waveguide that could enable the use of LED-based light sources. Finally, the detection limit of the investigated device for carbon dioxide gas detection is calculated.

Heat Transfer Enhancement of the Liquid-Cooled LED Illumination Module

2013 ◽  
Vol 284-287 ◽  
pp. 768-772 ◽  
Author(s):  
Rong Yuan Jou
Keyword(s):  
High Power ◽  
Heat Dissipation ◽  
Light Emitting Diode ◽  
Light Sources ◽  
The Finite Element Method ◽  
Liquid Cooling ◽  
Light Emitting ◽  
A Tec ◽  
Heat Sink Design ◽  
Temperature And Flow Fields

High-power light emitting diode (LED) modules offer several advantages over conventional light sources, but require effective thermal management for optimal performance, such as liquid cooling or thermoelectric cooling (TEC). This study compared the thermal performance of high-power LEDs with liquid cooling and TEC using both the finite element method and experiments. We considered a mutichip module in which the LEDs are immersed in one of three different cooling fluids in a metal enclosure with passive cooling or a TEC module. In the experiments, temperatures were measured by thermocouples. The temperature and flow fields of the liquid-cooled package inside the enclosure were analyzed in detail using a numerical model, and the results were validated against the experimental measurements. In this paper, we discuss the major design considerations when using liquid cooling and TEC. Our results show that for the illumination module considered in this study, appropriate heat sink design is crucial to optimizing performance with TEC, which can enhance the heat dissipation for small and compact LED modules.

Thermal Management for High Power Light-Emitting Diode Street Lamp

2010 ◽  
Author(s):  
M. Ying ◽  
S. M. L. Nai ◽  
P. Shi ◽  
J. Wei ◽  
C. K. Cheng ◽  
...  
Keyword(s):  
Thermal Management ◽  
Thermal Performance ◽  
High Power ◽  
Heat Dissipation ◽  
Light Emitting Diode ◽  
System Level ◽  
Light Emitting ◽  
High Power Led ◽  
Street Lamp ◽  
Lamp System

Light-emitting diode (LED) street lamp has gained its acceptance rapidly in the lighting system as one of choices for low power consumption, high reliability, dimmability, high operation hours, and good color rendering applications. However, as the LED chip temperature strongly affects the optical extraction and the reliability of the LED lamps, LED street lamp performance is heavily relied on a successful thermal management, especially when applications require LED street lamp to operate at high power and hash environment to obtain the desired brightness. As such, a well-designed thermal management, which can lower the LED chip operation temperature, becomes one of the necessities when developing LED street lamp system. The current study developed an effective heat dissipation method for the high power LED street lamp with the consideration of design for manufacturability. Different manufacturable structure designs were proposed for the high power street lamp. The thermal contact conductance between aluminum interfaces was measured in order to provide the system assembly guidelines. The module level thermal performance was also investigated with thermocouples. In addition, finite element (FE) models were established for the temperature simulation of both the module and lamp system. The coefficient of natural convection of the heat sink surface was determined by the correlation of the measurement and simulation results. The system level FE model was employed to optimize and verify the heat dissipation concepts numerically. An optimized structure design and prototype has shown that the high power LED street lamp system can meet the thermal performance requirements.

scholarly journals Effective Light Source for Illuminating Overhead Guide Signs and Improving Roadway Safety

2016 ◽  
Author(s):  
Mohammed S. Obeidat ◽  
Malgorzata J. Rys
Keyword(s):  
Cost Analysis ◽  
Light Source ◽  
Light Emitting Diode ◽  
Operating Cost ◽  
Mercury Vapor ◽  
Light Distribution ◽  
Light Sources ◽  
Good Efficiency ◽  
Light Emitting ◽  
Roadway Safety

Driver safety is considered an important issue to departments of transportation. One way to increase highway safety is to improve the visibility of overhead guide signs for drivers. Visibility improving methods include the use of sign illumination or retroreflective sheeting materials. This paper focuses on sign illumination by comparing five light sources including high pressure sodium (HPS), metal halide (MH), mercury vapor (MV), induction lighting, and light emitting diode (LED). A laboratory experiment was conducted to compare effective light distribution of each light source and a cost analysis was performed to compare initial, maintenance, and operating cost components of the light sources. Results of the light distribution experiment indicated that HPS was the optimum light source followed by MH, induction lighting, MV, and LED. Induction lighting is a promising lighting technology which features good efficiency and long life. According to cost analysis, induction lighting was the most effective source, followed by the LED, HPS, MV, and MH. Of the five light sources considered, induction lighting provided the best overall performance when considering initial cost, operating cost, expected maintenance, and sign illuminance. Environmentally, LED does not contain mercury, and for those agencies that prefer using sources that are friendlier with the environment, the LED can be their best choice.

scholarly journals Lifespan Characteristics of SMD-Type LED Exit Lights

2021 ◽  
Vol 21 (2) ◽  
pp. 59-64
Author(s):  
Jongjin Jung
Keyword(s):  
Light Source ◽  
Heat Dissipation ◽  
Light Sources ◽  
Improve Product Quality ◽  
Electrical Characteristics ◽  
Led Light ◽  
Source Current ◽  
The Relationship ◽  
Top View ◽  
Future Management

In this study, the electrical characteristics of SMD-type LED light sources, which have been used for most exit lights since 2007, were analyzed. The relationship between the electrical characteristics of the LED light source and the life of the light source was analyzed. An LED exit light that used a top-view LED and a power LED was used for this experiment. The sizes of the exit lights were medium and small. In addition, the electrical characteristics of the LED light source were analyzed by measuring the input current, light source current, and power values related to the life of the LED. As a result, when the exit lights were of the same size, the top-view LED exit light required less power and lower current than the power LED exit light, and the current and power waveforms were also good. It was also confirmed that the power LED exit light was out of the range of rated power for some samples. Therefore, when developing an LED exit light, checking the voltage, current, power, and heat dissipation of the light source together will improve product quality and future management.

scholarly journals Comparison of Depth of Cure, Hardness and Heat Generation of LED and High Intensity QTH Light Sources

2011 ◽  
Vol 05 (03) ◽  
pp. 299-304 ◽  
Author(s):  
Sayed Mostafa Mousavinasab ◽  
Ian Meyers
Keyword(s):  
Light Source ◽  
Exposure Time ◽  
High Power ◽  
Second Generation ◽  
Light Sources ◽  
Curing Time ◽  
Led Light ◽  
Depth Of Cure ◽  
Thermal Changes ◽  
Qth Light

ABSTRACTObjectives: To compare curing performance of a second generation LED curing light with a high power tungsten quartz halogen (QTH). Methods: A hybrid composite resin (Filtek Z 250, 3M, USA) was used as test material and cured using a second generation LED light (Translux Power BlueTM, Heraus Kulzer ,Germany) or a very high power QTH light unit (EMS, Switzerland). A two split aluminum mold was used to prepare ten samples with LED light source cured for forty seconds and ten samples prepared using high power QTH light unit, cured for four or six seconds recommended exposure time. Hardness, depth of cure (DOC) and thermal rise during exposure time by these light sources were measured. The data submitted to analysis of variance (ANOVA), Tukey's and student's t tests at 5% significance level. Results: Significant differences were found in hardness, DOC of samples cured by above mentioned light sources and also in thermal rises during exposure time. The curing performance of the tested QTH was not as well as the LED light. TPB light source produced the maximum hardness (81.25, 73.29, 65.49,55.83 and 24.53 for 0 mm, 1 mm, 2 mm, 3 mm and 4 mm intervals) and DOC (2.64 mm) values with forty seconds irradiation time and the high power (QTH) the least hardness (73.27, 61.51 and 31.59 for 0 mm, 1 mm and 2 mm, respectively) and DOC (2 mm) values with four seconds irradiation time.Thermal rises during 4 s and 6 s curing time using high power QTH and tested LED were 1.88˚C, 3˚C and 1.87˚C, respectively. Conclusions: The used high power LED light produced greater hardness and depth of cure during forty seconds exposure time compared to high power QTH light with four or six seconds curing time. Thermal rise during 6 s curing time with QTH was greater compared to thermal changes occurred during 40 s curing time with tested LED light source. There was no difference seen in thermal changes caused by LED light with 40 s and QTH light with 4 s exposure time. (Eur J Dent 2011;5:299- 304)

Effect of Temperature and Current on Luminous Efficiency of High Power LED

2011 ◽  
Vol 347-353 ◽  
pp. 310-313 ◽  
Author(s):  
Feng Rao ◽  
Zhi Chen Ge ◽  
Jin Lian Zhu
Keyword(s):  
Energy Saving ◽  
White Light ◽  
High Power ◽  
Light Emitting Diode ◽  
Luminous Efficiency ◽  
Effect Of Temperature ◽  
Light Emitting ◽  
Led Light ◽  
High Power Led ◽  
Changing Rate

Luminous efficiency of high power white light LED (light emitting diode) at different temperature and driver current is measured with the photometric, chromatic and electric characteristics analyzer. It is shown that the luminous efficiency decreases as the temperature and (or) the driver current increases. The highter the driver current is, the more strongly temperature worsens the efficiency. However, the changing rate of efficiency with current is similar at different temperature. At last, a luminous efficiency model with temperature and current is constructed. This research is very important for the design of energy-saving LED lamps.

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