Luminous and power quality analysis of office building light sources

Albu, HC; Halonen, Liisa; Tetri, Eino; Pop, Florin; Beu, Dorin

doi:10.1177/1477153512455941

Cited by 9 publications

(4 citation statements)

References 10 publications

(7 reference statements)

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“…Conventional electric light sources provide almost constant spectral composition 7,23 and constant light output when operated at fixed supply voltage apart from the effect of depreciation due to ageing. 24 The light output of these traditional sources may be varied by using different dimming techniques.…”

Section: Features and Desired Performance Of The Dynamic Light Sourcementioning

confidence: 99%

“…For indoor illumination, the preferred colour of illumination is white namely, warm white, neutral white and cool white, and it can be produced by incandescent lamps, fluorescent lamps or WLEDs. 23 WLEDs are the best choice as a dynamic light source. 20,26,26 The white light can be produced by LEDs by two means namely an ultra violet (UV) or blue LED with a yellow phosphor or by direct combination of three or more individual spectral emitters having peak spectrum emissions spaced across the visible spectrum.…”

Section: Features and Desired Performance Of The Dynamic Light Sourcementioning

confidence: 99%

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Evaluation of a light controller for a LED-based dynamic light source

Maiti

Roy

2017

Lighting Research & Technology

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In this paper, the performance of a dynamic light controller (DLC) is experimentally evaluated to achieve a dynamic light source consisting of alternative arrays of warm white and cool white light-emitting diodes (LEDs). The DLC is programmed to drive the light source through both step and continuous variations of correlated colour temperature (CCT) and light output. For step variation, the DLC generates pulse width modulation (PWM) signals to drive the LED arrays to achieve 16 desired set points out of four CCTs (2900–5600 K) and four illuminances (100–300 Lux). The measured set points show deviations within acceptable limits. For continuous variation, the DLC is programmed to make the dynamic light source follow a time-varying pattern of CCT and Illuminance. The variations of measured values are mostly within acceptable limits except at lower CCT and illuminance points. The measured duty cycles of the generated PWM signals from the DLC are almost equal to the corresponding calculated values for both the step and continuous variations indicating good performance. The measured deviations are caused by the differences in lumen output at duty cycles <10% compared to the estimated values.

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Section: Features and Desired Performance Of The Dynamic Light Sourcementioning

confidence: 99%

Section: Features and Desired Performance Of The Dynamic Light Sourcementioning

confidence: 99%

Evaluation of a light controller for a LED-based dynamic light source

Maiti

Roy

2017

Lighting Research & Technology

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“…This includes light source efficiency. Indeed, Albu et al [1] investigated luminous and power quality measurements of different office building light sources. Their results show that LED luminaires offer a luminous efficacy advantage over other types of luminaires but also points out that poor power quality management effects LED luminaire performance negatively.…”

Section: Introductionmentioning

confidence: 99%

The effect of age on white light perception.

Westhuyzen

Leuschner²

2018

IJSL

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The way that persons from different age groups experience “white light” is investigated. Human eye lens transmission changes spectrally with age and this may influence the way that humans from different ages experiences light. Such a difference may be important in industrial and medical environments. Two different age groups, one group younger than 40 years of age and another group older than 50 years of age were subjected to the same “white” definition task. A conventional single-booth setup was used where observers were able to adjust the intensity of four coloured LED’s. Results of the psychophysical test procedure were used to generate specifications of two light sources, as selected by the two age groups. The two age groups selected two very different light sources when tasked to achieve a “perception” of white. Results show that the older group prefers a source with a colour rendering index number of 89 and the younger group prefers a source with a colour rendering index number of 74. The sources selected by the two age groups specifies correlated colour temperature values of 5150 K for the older age group and 6592 K for the younger group.

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“…For outdoor lighting, the LED street light is replacing the gas-discharge lamp. [8][9][10][11][12][13] The growth of the luminous efficacy of white LEDs 14,15 has enabled LEDbased luminaires to enter more and more lighting fields, including indoor and outdoor sports lighting. 12,16 For indoor sports, the lighting should provide a high enough illuminance to ensure good visibility of the target.…”

Section: Introductionmentioning

confidence: 99%

An LED-based luminaire for badminton court illumination

Lee

Yang

Chang

et al. 2015

Lighting Research & Technology

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In this paper, the design of a luminaire for badminton court illumination is demonstrated from concept through computer simulation, construction trials, on-site installation, comparison with simulations and, finally, evaluations of the illuminated environment before and after the installation of the luminaires. The luminaire is composed of two high-performance light-emitting diode lighting modules, volume scattering diffusers with a one-shot transmittance higher than 70% and a reflecting cavity with a reflectivity higher than 85%. The luminaire has three different exit faces forming three Lambertian-like light sources with low luminance so as to reduce glare to the players when looking at the flight of the shuttlecock. Under similar total electric power consumption, compared to the original traditional lighting, the average illuminance on the ground is enhanced by about 300% and the uniformity is obviously improved. A questionnaire was issued to players before and after the installation of the new light-emitting diode luminaires. The new installation gained much more positive responses for brightness, comfort and number of usable courts from the players than the old installation.

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Luminous and power quality analysis of office building light sources

Cited by 9 publications

References 10 publications

Evaluation of a light controller for a LED-based dynamic light source

Evaluation of a light controller for a LED-based dynamic light source

The effect of age on white light perception.

An LED-based luminaire for badminton court illumination

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