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.

Nominal risk analysis of the blue light from LED luminaires in indoor lighting design

Optik ◽  
2020 ◽  
Vol 223 ◽  
pp. 165599
Author(s):  
David Baeza Moyano ◽  
Silvia Baeza Moyano ◽  
Miguel Gómez López ◽  
Alejandro Salcedo Aznal ◽  
Roberto Alonso González Lezcano
Keyword(s):  
Risk Analysis ◽  
Blue Light ◽  
Lighting Design ◽  
Indoor Lighting

scholarly journals The dark side of artificial light

2020 ◽  
Vol 42 (5) ◽  
pp. 32-35
Author(s):  
Jun Yang ◽  
David A Hendrix ◽  
Jadwiga M Giebultowicz
Keyword(s):  
Blue Light ◽  
Light Exposure ◽  
Model Organism ◽  
Dark Side ◽  
Constant Darkness ◽  
Artificial Light ◽  
Light Emitting ◽  
Adverse Health Effects ◽  
Ambient Lighting

Light is necessary for life, but increasing exposure to artificial light may be detrimental to human health. With prevalent use of light-emitting diodes (LEDs) in ambient lighting and electronic devices, humans are increasingly exposed to blue light that appears white due to addition of other colours. Excessive blue light can damage eyes, but it is not known whether daily LED exposure across lifespan may have other adverse health effects. A recent study in short-lived model organism Drosophila melanogaster revealed that cumulative, long-term exposure to blue light impacts brain function, accelerates the aging process and significantly shortens lifespan compared to flies maintained in constant darkness or in white light with blue wavelengths blocked. Increased mortality and brain neurodegeneration was also observed in flies with genetically ablated eyes, demonstrating damage to non-retinal cells. As molecular responses to light are similar in the cells of both fruit flies and humans, these studies suggest that lifelong daily blue light exposure may impair cellular health in humans.

Design & Development of a Solar Powered, CCT changing R-B-W LED Based Artificial Window

2018 ◽  
pp. 191-198
Author(s):  
Basudeb Das ◽  
Asit Kumar Sur ◽  
Saswati Mazumdar
Keyword(s):  
Light Output ◽  
Well Being ◽  
Lighting Design ◽  
White Led ◽  
Design Development ◽  
Visual Effects ◽  
Night Time ◽  
Solar Powered ◽  
Indoor Lighting ◽  
Dynamic Lighting

The concept of Artificial Window is being applied in indoor lighting design since couple of years and is easily available in market, but the main drawback of these artificial windows is their constant CCT (Correlated Colour Temperature) light output. The developed artificial window is a CCT changing system, which follows the preset pattern of daylight CCT throughout the day. It will very effective for those, who stay in a window­less room or a closed room. It is known that light not only has the visual effects but also has photo­biological effects. A dynamic light is very helpful in well being, positive mood, increased concentration, alertness consequently increased productivity. The developed system is solar powered at daytime; this window is powered by the SPV module directly without using battery. A small battery is being charged simultaneously which powers the system at night time. The window is made using two types of coloured LEDs: Red and Blue and Warm White LED. The new concept of dynamic lighting provides a very wide CCT range from 2300 K to 10800 K.

scholarly journals Tuning the white light spectrum of light emitting diode lamps to reduce attraction of nocturnal arthropods

2015 ◽  
Vol 370 (1667) ◽  
pp. 20140125 ◽  
Author(s):  
Travis Longcore ◽  
Hannah L. Aldern ◽  
John F. Eggers ◽  
Steve Flores ◽  
Lesly Franco ◽  
...  
Keyword(s):  
Los Angeles ◽  
White Light ◽  
Light Emitting Diode ◽  
Spectral Composition ◽  
Unintended Consequences ◽  
Light Spectrum ◽  
Ecological Processes ◽  
Light Emitting ◽  
Study Sites ◽  
Indoor Lighting

Artificial lighting allows humans to be active at night, but has many unintended consequences, including interference with ecological processes, disruption of circadian rhythms and increased exposure to insect vectors of diseases. Although ultraviolet and blue light are usually most attractive to arthropods, degree of attraction varies among orders. With a focus on future indoor lighting applications, we manipulated the spectrum of white lamps to investigate the influence of spectral composition on number of arthropods attracted. We compared numbers of arthropods captured at three customizable light-emitting diode (LED) lamps (3510, 2704 and 2728 K), two commercial LED lamps (2700 K), two commercial compact fluorescent lamps (CFLs; 2700 K) and a control. We configured the three custom LEDs to minimize invertebrate attraction based on published attraction curves for honeybees and moths. Lamps were placed with pan traps at an urban and two rural study sites in Los Angeles, California. For all invertebrate orders combined, our custom LED configurations were less attractive than the commercial LED lamps or CFLs of similar colour temperatures. Thus, adjusting spectral composition of white light to minimize attracting nocturnal arthropods is feasible; not all lights with the same colour temperature are equally attractive to arthropods.

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

scholarly journals Blue-Light Levels Emitted from Portable Electronic Devices Compared to Sunlight

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4276
Author(s):  
David Baeza Moyano ◽  
Yolanda Sola ◽  
Roberto Alonso González-Lezcano
Keyword(s):  
Blue Light ◽  
Electronic Device ◽  
Electronic Devices ◽  
Spectral Irradiance ◽  
Radiative Transfer Model ◽  
Transfer Model ◽  
Spectral Emission ◽  
Visual Effects ◽  
Light Emitting ◽  
Light Levels

Over recent years, a technological revolution has taken place in which conventional lighting has been replaced by light emitting diodes (LEDs). Some studies have shown the possibility that blue light from these artificial sources could have deleterious effects on the retina. Considering that people spend a non-negligible time in front of screens from computers and mobile phones, the eyes receive blue light of different intensities depending on the source. Nevertheless, any study about the visual and non-visual effects of blue light must consider precise measurements taken from actual artificial sources. For this reason, we have analyzed the spectral emission of 10 different electronic devices and weighted them according to the hazard caused by blue light to the eyes, comparing the results with solar radiation simulated with a radiative transfer model. The maximum spectral irradiance of the measured electronic devices at 10 cm from the detector was located between 440 nm and 460 nm. The irradiance for blue light hazard ranged from 0.008 to 0.230 Wm−2 depending on the particular characteristics of each electronic device. In contrast, the solar radiances in the same spectral range are larger both under clear and cloudy conditions.

A fresh approach to interior lighting design: The design objective – direct flux procedure

2017 ◽  
Vol 50 (8) ◽  
pp. 1142-1163 ◽  
Author(s):  
C Cuttle
Keyword(s):  
Flux Distribution ◽  
Design Procedure ◽  
Lighting Design ◽  
Luminous Flux ◽  
Visual Effects ◽  
General Application ◽  
Interior Lighting ◽  
Published Research ◽  
Indoor Spaces ◽  
Selection Of

A new lighting design procedure is proposed based on how lighting influences the appearance of indoor spaces and their contents. Exitance is the measure of the density of luminous flux (lm/m2) exiting, or emerging from, a surface, and provides an effective basis for relating the quantity and distribution of lighting to peoples' assessments of its visual effects. The procedure guides users from identifying selected lighting design objectives relating to how peoples' assessments of appearance are affected by lighting, to developing a specification for the direct flux distribution that will optimally achieve those objectives. Applications can range from basic to complex. A selection of previously published lighting concepts is reviewed in the light of recently published research, and based on these concepts, the procedure takes the form of a downloadable spreadsheet that enables users to prioritise between efficient flux utilisation and achievement of design-oriented objectives. While it is recognised that more research is needed before the procedure could be adopted for general application, the aim of this paper is to demonstrate the opportunities offered by a practical alternative to current lighting practice.

Artificial light from light emitting diodes (LEDs) with a high portion of blue light results in shorter poinsettias compared to high pressure sodium (HPS) lamps

2012 ◽  
Vol 147 ◽  
pp. 136-143 ◽  
Author(s):  
M. Ashraful Islam ◽  
Goutam Kuwar ◽  
Jihong Liu Clarke ◽  
Dag-Ragnar Blystad ◽  
Hans Ragnar Gislerød ◽  
...  
Keyword(s):  
High Pressure ◽  
Blue Light ◽  
Light Emitting Diodes ◽  
Artificial Light ◽  
Light Emitting
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