Precise control of a correlated color temperature tunable luminaire for a suitable luminous environment

Kim, In-Tae; Choi, An-Seop; Jeong, Jae-Weon

doi:10.1016/j.buildenv.2012.06.001

Cited by 26 publications

(14 citation statements)

References 15 publications

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“…T jMAX =T a-max +(R thj-sp +R thsp-h )*P LED +R thh-a *P tot (4) where: R th j-sp -thermal resistance from junction to solder point; R th sp-h -thermal resistance from solder point to heat sink; R th h-a -thermal resistance from heat sinks to ambient. P LED is the power of one LED chip: For one LED module if we accept maximum junction temperature T jMAX = 80°C; ambient temperature 45°C and maximum operating current, calculations on the basis of dependence (4) show that the thermal resistance of the heat sink should be lower than 2.5°C/W.…”

Section: Thermal Management's Calculationsmentioning

confidence: 99%

“…P LED is the power of one LED chip: For one LED module if we accept maximum junction temperature T jMAX = 80°C; ambient temperature 45°C and maximum operating current, calculations on the basis of dependence (4) show that the thermal resistance of the heat sink should be lower than 2.5°C/W. For experimental LED module is used heat sink with thermal resistance R th h-a = 2°C/W.…”

Section: Thermal Management's Calculationsmentioning

confidence: 99%

“…The development of LED technology nowadays provides huge diversity of different light sources with variety of spectral properties suitable for great range of application [1][2][3][4][5][6][7][8][9][10]. But artificial light has also impact of human beings.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tunable LED lamp - Design and thermal management

Mashkov

Gyoch

Kandilarov

et al. 2015

2015 38th International Spring Seminar on Electronics Technology (ISSE)

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The aim of the present work is the design and construction of LED lamp with tunable spectral characteristics. In order to achieve basic light property as spectral power distribution (SPD) of daylight at noon and late afternoon, particular mixture of LEDs with different spectral and power characteristics and proper control of the LEDs' operation are used. The differences in the LEDs' thermal properties and operational regimes complicate the lamp's thermal management and demand precise investigation of the LEDs' thermal performance. These analyses are made at different ambient temperatures ranging from 20ºC to 45ºC and various current values through LEDs -up to their maximum values. Infrared thermography is used for the evaluation of the temperature distribution on LEDs and the heat sink. Thermal management investigations are used in order to define safety operating conditions for LEDs in different ambient conditions.

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Section: Thermal Management's Calculationsmentioning

confidence: 99%

Section: Thermal Management's Calculationsmentioning

confidence: 99%

See 1 more Smart Citation

Tunable LED lamp - Design and thermal management

Mashkov

Gyoch

Kandilarov

et al. 2015

2015 38th International Spring Seminar on Electronics Technology (ISSE)

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“…In addition, as concerns in well-being and quality of life continue to rise, the demands among users involving lightings gradually advance from mere brightness and efficiency to the quality of lighting environment. Accordingly, LED digital control convergence technology, which replaces low-efficiency light bulbs and fluorescent light containing harmful substances such as mercury, has led to the creation and increasing popularity of emotional and human-friendly lighting environment [ 3 – 6 ].…”

Section: Introductionmentioning

confidence: 99%

“…It goes beyond the function of illuminating and utilizes various features of light that affect the visual and nonvisual experiences of humans [ 4 ]. Recently, this type of LED lighting has advanced into a smart system lighting that reflects the emotions of users, pursues convenience in daily life, and saves energy in convergence of IT and knowledge of various elements such as surrounding environments, human behaviors, and so forth [ 6 , 8 ]. Most of the existing lighting systems, however, focus on improving energy efficiency by automatically turning the light on or off depending on the user's presence or location [ 9 , 10 ] or controlling dimming function depending on the amount of natural light coming in [ 11 – 13 ].…”

Section: Introductionmentioning

confidence: 99%

LED Context Lighting System in Residential Areas

Kwon

Lim

2014

The Scientific World Journal

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As issues of environment and energy draw keen interest around the globe due to such problems as global warming and the energy crisis, LED with high optical efficiency is brought to the fore as the next generation lighting. In addition, as the national income level gets higher and life expectancy is extended, interest in the enhancement of life quality is increasing. Accordingly, the trend of lightings is changing from mere adjustment of light intensity to system lighting in order to enhance the quality of one's life as well as reduce energy consumption. Thus, this study aims to design LED context lighting system that automatically recognizes the location and acts of a user in residential areas and creates an appropriate lighting environment. The proposed system designed in this study includes three types of processing: first, the creation of a lighting environment index suitable for the user's surroundings and lighting control scenarios and second, it measures and analyzes the optical characteristics that change depending on the dimming control of lighting and applies them to the index. Lastly, it adopts PIR, piezoelectric, and power sensor to grasp the location and acts of the user and create a lighting environment suitable for the current context.

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Influence of chromatic and lighting on the visual environment of the elderly: A critical literature review

Guerry

Caumon

Bécheras

et al. 2020

Color Research & Application

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The use of color and lighting as factors for adapting the housing of the elderly is tending to develop, in response to demographic data on the aging of the population and its impact on lifestyles. Adapting the environment for those over 60 years has become a national issue for public policy. So this article takes stock of the studies carried out on this issue. We have to review all the literature devoted to this subject, focusing on research products dealing with the color and light interaction in the indoor environment of seniors.

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Precise control of a correlated color temperature tunable luminaire for a suitable luminous environment

Cited by 26 publications

References 15 publications

Tunable LED lamp - Design and thermal management

Tunable LED lamp - Design and thermal management

LED Context Lighting System in Residential Areas

Influence of chromatic and lighting on the visual environment of the elderly: A critical literature review

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