Photometric and colorimetric analysis of light emitting diode luminaires for interior lighting design

2021 ◽  
Author(s):  
David B. Moyano ◽  
Silvia B. Moyano ◽  
Miguel G. López ◽  
Alejandro S. Aznal ◽  
Roberto A. González L.
Keyword(s):  
Light Emitting Diode ◽  
Lighting Design ◽  
Colorimetric Analysis ◽  
Light Emitting ◽  
Interior Lighting

An Intelligent Personas System for Determining LED Lighting Design Requirements

2011 ◽  
Vol 145 ◽  
pp. 43-47
Author(s):  
Kevin C. Tseng ◽  
Chi Wei Chung
Keyword(s):  
Light Emitting Diode ◽  
Lighting Design ◽  
Development Stage ◽  
Design Team ◽  
Light Emitting ◽  
System A ◽  
Novel Approach ◽  
Design Requirements ◽  
Market Trends ◽  
Effective Design

The intent of this paper is to illustrate a personas system effective design to aid development of new products. This system would help a design team find and understand the lifestyle of target customers by using personas method in early concept development stage. In order to quickly realize market trends, easily collect customer requirements and readily integrate user opinions, the proposed system is capable of helping experts in different domains concurrently share their ideas in real time and discuss with each other without geographic limitation. In addition, a novel approach is proposed, named as ‘Personas Matrix’, to quantify the requirements which can accelerate the assessment of true needs. Finally, in order to validate the proposed system, a LED (Light-Emitting Diode) project was applied to test the functionality of the approach and the usefulness of the system thus helping the design team refine requirements, simplify requirement gathering, and prompt the assessment.

scholarly journals Towards a Sustainable Indoor Lighting Design: Effects of Artificial Light on the Emotional State of Adolescents in the Classroom

2020 ◽  
Vol 12 (10) ◽  
pp. 4263 ◽  
Author(s):  
David Baeza Moyano ◽  
Mónica San Juan Fernández ◽  
Roberto Alonso González Lezcano
Keyword(s):  
Blue Light ◽  
Emotional State ◽  
Spectral Composition ◽  
Lighting Design ◽  
Artificial Light ◽  
Visual Effects ◽  
Light Emitting ◽  
Interior Lighting ◽  
Indoor Lighting ◽  
Research Show

In recent years, articles have been published on the non-visual effects of light, specifically the light emitted by the new luminaires with light emitting diodes (LEDs) and by the screens of televisions, computer equipment, and mobile phones. Professionals from the world of optometry have raised the possibility that the blue part of the visible light from sources that emit artificial light could have pernicious effects on the retina. The aim of this work is to analyze the articles published on this subject, and to use existing information to elucidate the spectral composition and irradiance of new LED luminaires for use in the home and in public spaces such as educational centers, as well as considering the consequences of the light emitted by laptops for teenagers. The results of this research show that the amount of blue light emitted by electronic equipment is lower than that emitted by modern luminaires and thousands of times less than solar irradiance. On the other hand, the latest research warns that these small amounts of light received at night can have pernicious non-visual effects on adolescents. The creation of new LED luminaires for interior lighting, including in educational centers, where the intensity of blue light can be increased without any specific legislation for its control, makes regulatory developments imperative due to the possible repercussions on adolescents with unknown and unpredictable consequences.

Spectral optimisation and a novel lighting-design space based on circadian stimulus

2017 ◽  
Vol 50 (8) ◽  
pp. 1198-1211 ◽  
Author(s):  
Q Dai ◽  
W Cai ◽  
L Hao ◽  
W Shi ◽  
Z Wang
Keyword(s):  
Design Space ◽  
Light Emitting Diode ◽  
Lighting Design ◽  
Indoor Environments ◽  
Potential Health ◽  
Light Emitting ◽  
Mixing Method ◽  
The Common ◽  
White Light Emitting Diodes ◽  
Visual Brightness

With the recent advances in photobiology research and light-emitting diode technology, lighting considering circadian effects and the potential health benefits attract much attention. In this study, we demonstrate that the common practice of spectral optimisation of light for high visual efficacy can potentially lead to very inefficient delivery of circadian stimulus, which contributes to the lack of circadian entrainment that is likely to happen in indoor environments with only electric lighting. To optimise spectra of white light-emitting diodes for circadian efficacy, a four-component colour-mixing method with explicit analytical solutions is introduced. Energy-saving up to 29% is achieved at a target circadian stimulus of 0.35, by switching from the traditional maximum-visual-efficacy strategy to a maximum-circadian-efficacy strategy. Moreover, we propose a framework of a novel lighting-design space which allows practitioners to explore the possible combinations of circadian stimulus, visual illuminance and colour temperature. Solutions are provided for scenarios where activation of the circadian system should be avoided while a reasonable visual brightness appearance is maintained.

Synchronization of Chaotic Quantum Dot Light Emitting Diodes under Optical Feedback Effect

2020 ◽  
pp. 144-148
Keyword(s):  
Quantum Dot ◽  
Delay Time ◽  
Chaos Synchronization ◽  
Optical Feedback ◽  
Light Emitting Diode ◽  
Feedback Effect ◽  
Complete Synchronization ◽  
Light Emitting ◽  
Coupling Methods ◽  
Coupling Parameters

Chaos synchronization of delayed quantum dot light emitting diode has been studied theortetically which are coupled via the unidirectional and bidirectional. at synchronization of chaotic, The dynamics is identical with delayed optical feedback for those coupling methods. Depending on the coupling parameters and delay time the system exhibits complete synchronization, . Under proper conditions, the receiver quantum dot light emitting diode can be satisfactorily synchronized with the transmitter quantum dot light emitting diode due to the optical feedback effect.

Effects of Nitridation Time on Top-emission Inverted Organic Light Emitting Diode

PIERS Online ◽  
2007 ◽  
Vol 3 (6) ◽  
pp. 821-824 ◽  
Author(s):  
Chien-Chang Tseng ◽  
Liang-Wen Ji ◽  
Yu Sheng Tsai ◽  
Fuh-Shyang Juang
Keyword(s):  
Light Emitting Diode ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Nitridation Time ◽  
Organic Light
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