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6 February 2012Blue enhanced light sources: opportunities and risks
Natural daylight is characterized by high proportions of blue light. By proof of a third type of photoreceptor in the human
eye which is only sensitive in this spectral region and by subsequent studies it has become obvious that these blue
proportions are essential for human health and well being. In various studies beneficial effects of indoor lighting with
higher blue spectral proportions have been proven.
On the other hand with increasing use of light sources having enhanced blue light for indoor illumination questions are
arising about potential health risks attributed to blue light. Especially LED are showing distinct emission characteristics
in the blue. Recently the French agency for food, environmental and occupational health & safety ANSES have raised
the question on health issues related to LED light sources and have claimed to avoid use of LED for lighting in schools.
In this paper parameters which are relevant for potential health risks will be shown and their contribution to risk factors
will quantitatively be discussed. It will be shown how to differentiate between photometric parameters for assessment of
beneficial as well as hazardous effects.
Guidelines will be discussed how blue enhanced light sources can be used in applications to optimally support human
health and well being and simultaneously avoid any risks attributed to blue light by a proper design of lighting parameters.
In the conclusion it will be shown that no inherent health risks are related to LED lighting with a proper lighting design.
Dieter Lang
"Blue enhanced light sources: opportunities and risks", Proc. SPIE 8278, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVI, 827803 (6 February 2012); https://doi.org/10.1117/12.906170
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Dieter Lang, "Blue enhanced light sources: opportunities and risks," Proc. SPIE 8278, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVI, 827803 (6 February 2012); https://doi.org/10.1117/12.906170