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Nya ljuskällors betydelse för vakenhet välbefinnande och prestation

Laike, Thorbjörn LU ; Govén, Tommy and Sjöberg, Klas LU (2011)
Abstract
In a laboratory study the impact of the surrounding light on alertness was study. Two types of
light sources were examined, LEDs and T5 fluorescent tubes. The illuminance level in the
working area was kept constant (500 lx), while the surrounding light was varied between 100
och 350 cd/m2
. Subjective ratings of the emotional status and the experience of the lighting
environment as well as physiological measurements of cortisol and melatonin levels in the
saliva were conducted. The results show that the higher the surrounding light the higher the
phsysiological cortisol levels. There were no significant differences in the experience of the
light, except that the LED light source were a little bit more... (More)
In a laboratory study the impact of the surrounding light on alertness was study. Two types of
light sources were examined, LEDs and T5 fluorescent tubes. The illuminance level in the
working area was kept constant (500 lx), while the surrounding light was varied between 100
och 350 cd/m2
. Subjective ratings of the emotional status and the experience of the lighting
environment as well as physiological measurements of cortisol and melatonin levels in the
saliva were conducted. The results show that the higher the surrounding light the higher the
phsysiological cortisol levels. There were no significant differences in the experience of the
light, except that the LED light source were a little bit more bright. It should, however, be
stressed that the light sources were very well shielded and no glare were at hand.The results
should be interpreted with caution, but with the chosen LED light sources no harmful effects
were seen in comparison to fluorescent tubes. LED may be seen as a good alternative as long
as the lighting design is done careful so that glare is avoided. The study comprised 42 subjects
between 18-68 years of age, mean age 43 years. Preliminary results have been presented at
Energitinget 2010 and at CEEBELs conference in Katrineholm. During the spring a series of
presentations will be held. (Less)
Please use this url to cite or link to this publication:
author
organization
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Book/Report
publication status
published
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publisher
Ceebel
language
Swedish
LU publication?
yes
id
49608988-1e11-4601-b1b6-0c009ccea0e6 (old id 3470173)
alternative location
http://ceebel.se/wp-content/uploads/2011/03/SLUTRAPPORT1.pdf
date added to LUP
2013-02-18 14:24:25
date last changed
2017-06-26 14:08:10
@techreport{49608988-1e11-4601-b1b6-0c009ccea0e6,
  abstract     = {In a laboratory study the impact of the surrounding light on alertness was study. Two types of<br/>light sources were examined, LEDs and T5 fluorescent tubes. The illuminance level in the<br/>working area was kept constant (500 lx), while the surrounding light was varied between 100<br/>och 350 cd/m2<br/>. Subjective ratings of the emotional status and the experience of the lighting<br/>environment as well as physiological measurements of cortisol and melatonin levels in the<br/>saliva were conducted. The results show that the higher the surrounding light the higher the<br/>phsysiological cortisol levels. There were no significant differences in the experience of the<br/>light, except that the LED light source were a little bit more bright. It should, however, be<br/>stressed that the light sources were very well shielded and no glare were at hand.The results<br/>should be interpreted with caution, but with the chosen LED light sources no harmful effects<br/>were seen in comparison to fluorescent tubes. LED may be seen as a good alternative as long<br/>as the lighting design is done careful so that glare is avoided. The study comprised 42 subjects<br/>between 18-68 years of age, mean age 43 years. Preliminary results have been presented at<br/>Energitinget 2010 and at CEEBELs conference in Katrineholm. During the spring a series of<br/>presentations will be held. },
  author       = {Laike, Thorbjörn and Govén, Tommy and Sjöberg, Klas},
  institution  = {Ceebel},
  language     = {swe},
  title        = {Nya ljuskällors betydelse för vakenhet välbefinnande och prestation},
  year         = {2011},
}