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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5404

Title: Dark adaptation time for humans, after viewing a target illuminated with two different types of light sources
Authors: Baumbach, J
Coetzee, EM
Sieberhagen, RH
Jonker, CR
Keywords: Dark adaptation times
Illumination
Scotopic recovery time
Tungsten-Halogen
Spectral distribution
Luminous Intensity
LED illuminators
Issue Date: Jul-2011
Citation: Baumbach, J, Coetzee, EM et al. 2011. Dark adaptation time for humans, after viewing a target illuminated with two different types of light sources. 27th session of the CIE (International Commission on Illumination), Sun City, South Africa, 11-15 July 2011
Series/Report no.: Workflow request;6808
Abstract: The differences in scotopic recovery time between LED illuminators and a tungsten-halogen illuminator was investigated. The spectral distribution and the luminous intensity distribution of all the supplied illuminators were measured. The scotopic recovery time was measured, using a low-contrast USAF bar target and a low-level light source for background illumination. We were not able to measure a significant difference in scotopic recovery time, after the target was illuminated with the two light sources. The measured luminance levels in the laboratory are expected to differ substantially to those in the field due to the low reflectance of natural targets. Therefore, laboratory measurements should be complimented by field measurements. Our results, supported by a literature study, highlighted the necessity for further research using the current methods, as well as the validation of results by using an adaptometer.
Description: 27th session of the CIE (International Commission on Illumination), Sun City, South Africa, 11-15 July 2011
URI: http://hdl.handle.net/10204/5404
ISBN: 9783901906992
Appears in Collections:Safety and security
Landward sciences
Technology for special operations
Optronic sensor systems
Aeronautic systems
Infrastructure systems and operations
General science, engineering & technology

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