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The National Institute for Occupational Safety and Health (NIOSH)





Mining Publication: Discomfort Glare Comparison for Various LED Cap Lamps
Keywords: Cap lamps Glare
Original creation date: May 2011
Authors: JJ Sammarco, AG Mayton, TJ Lutz, S Gallagher
Peer Reviewed Journal Article - May 2011
Download PDF Document (0.47 MB)
NIOSHTIC2 Number: 20038907
IEEE Trans Ind Appl 2011 May-Jun; 47(3):1168-1174
Researchers at the National Institute for Occupational Safety and Health (NIOSH) are investigating different lighting technologies with the objective of improving mine safety. This paper presents the results from an ongoing study that compares discomfort glare for different light-emitting diode (LED) cap lamps using the de Boer glare rating scale. The cap lamps tested included two commercially-available LED cap lamps and one NIOSH prototype LED cap lamp tested at three different illumination levels. Prior research indicated that the NIOSH prototype enabled much better visual performance as compared to other LED cap lamps. It uses three LEDs that produce multiple illumination areas in comparison to commercially-available cap lamps that use one LED and projects a narrow spot pattern. Across subjects and cap lamp test conditions, measured illuminances (averaged at both eyes) varied from 0.62 to 3.73 lx, whereas the de Boer glare ratings varied from 4.86 to 7.71. An analysis of variance based on 15 subjects indicated a significant difference in the discomfort glare due to cap lamps (F4,52 = 18.01, p < 0.001). Post hoc tests indicate that one of the commercially available cap lamps exhibited lower discomfort scores, with no statistically significant differences detected between the others. Thus, the NIOSH prototype cap lamp does not cause excessive discomfort glare yet enables better visual performance.
Image of publication Discomfort Glare Comparison for Various LED Cap LampsPeer Reviewed Journal Article - May 2011
Download PDF Document (0.47 MB)
NIOSHTIC2 Number: 20038907
IEEE Trans Ind Appl 2011 May-Jun; 47(3):1168-1174
See Also
Approved Electric Lamps for Miners
Experiments on Personal Equipment for Low Seam Coal Miners: IV. Incorporating Coiled Cord Into Cap Lamp Battery Cords
Illumination
Improved LED Mine Lamp Designs
Mine Illumination: A Historical and Technological Perspective
NIOSH Illumination Research Addresses Visual Performance Needs with LED Technology
Technological Aspects of Solid-State and Incandescent Sources for Miner Cap Lamps
Technological Aspects of Solid-State and Incandescent Sources for Miner Cap Lamps
Visual Performance for Incandescent and Solid-State Cap Lamps in an Underground Mining Environment
Visual Performance for Trip Hazard Detection When Using Incandescent and LED Miner Cap Lamps
Waveform Generator for (EM) Location of Trapped Miners
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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