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Evaluation of peripheral visual performance when using incandescent and LED miner cap lamps.

Authors
Sammarco-JJ; Reyes-M; Bartels-J; Gallagher-S
Source
IAS '08: Conference Record of the 2008 IEEE Industry Applications Conference: Forty-third IAS Annual Meeting, October 5-9, 2008, Edmonton, Alberta, Canada. Piscataway, NJ: Institute of Electrical and Electronics Engineers, 2008 Oct; :1-8
NIOSHTIC No.
20034730
Abstract
Illumination plays a critical role in an underground miner's safety because miners depend most heavily on visual cues to recognize hazards. Mobile mining machinery, located in the miner's peripheral field-of-view (10 to about 60 off-axis), may pose potential pinning and striking hazards. The main objective of this research was to determine if there were peripheral visual performance improvements for the detection of moving objects when using cool-white light-emitting diode (LED) cap lamps as compared to incandescent (INC) light bulbs commonly used in miner cap lamps. The cap lamp variable of interest is the spectral power distribution (SPD); the illuminances were normalized by a diffusion filter. The second objective was to determine if age is a factor for peripheral visual performance. This is important because the workforce is aging - the average miner age is about 43 years old. Thirty subjects participated in the study; ten subjects each in the age groups of younger (18 to 25 years), middle (40 to 50 years), and older (50+ years). Visual performance was quantified by the subjects' speed and accuracy of response to detect the rotation of high-contrast (white) circular targets located 3.83 meters (m) away at -20, 40, and 50 off-axis. The speed of detection and the number of missed target rotations (accuracy) were measured. The prototype LED cap lamp results were best with a 11% to 15% improvement compared to the INC and LED cap lamps respectively. Age does appear to be a significant factor. For the middle and older age groups', target movement detection time increased 75% and 60% and the number of missed targets increased 500% and 450% respectively in comparison to the youngest age group. The results also suggest that target location is a significant factor. The subjects' target movement detection time for the 40 and 50 target movements increased 16% and 69% respectively as compared to the -20 target.
Keywords
Mining-industry; Mining-equipment; Underground-mining; Visual-fields; Visual-perception; Light-source; Lighting
Contact
John J Sammarco, National Institute for Occupational Safety and Health, 626 Cochran Mill Road, PO Box 18070, Pittsburgh, PA 15236
Publication Date
20081005
Document Type
Conference/Symposia Proceedings
Email Address
Jsammarco@cdc.gov
Fiscal Year
2009
NTIS Accession No.
NTIS Price
ISBN No.
9781424422791
ISSN
0197-2618
NIOSH Division
PRL
Priority Area
Mining
Source Name
IAS '08: Conference Record of the 2008 IEEE Industry Applications Conference: Forty-third IAS Annual Meeting, October 5-9, 2008, Edmonton, Alberta, Canada
State
PA; NJ
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