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Document ID (ISN)52962
CIS number 89-2085
ISSN - Serial title 0829-0369 - Travail et santÚ
Year 1989
Convention or series no.
Author(s) Desnoyers L., Dumont D.
Title Cap lamps and visibility in mines: an exploratory study
Original title Lampes de chapeau et visibilitÚ dans les mines: une Útude exploratoire [in French]
Bibliographic information Fall 1989, Vol.5, No.3, p.S19-S23. 7 ref.
Abstract Three lamp models were tested. Illumination levels, measured 2 meters in front of the lamps, varied from 380 to 2500 lux when the lamps were adjusted for narrow beam lighting (approximately 5░ of arc). Adjusting the lamps for wide beam lighting reduced centre-field illumination by 80 to 90% while increasing levels in the immediate periphery. At the end of the 7 hour shifts, illumination levels produced by new lamps were reduced by 45 to 60%. Used lamps were still in service which gave off only 2/3 to 1/4 of the illumination produced by new lamps. Rockface reflectance averages only 9 to 22% and therefore miners use their lamps set for narrow beam illumination, in order to obtain high enough luminances. However, this also produces luminance ratios as high as 350:1 between the center of the visual field and its immediate periphery. This value is 100 times more than the maximum level recommended to avoid glare.
Descriptors (primary) underground mining; visibility assessment; cap lamps
Descriptors (secondary) lighting
Document type D - Periodical articles
Subject(s) Mines and quarries
Broad subject area(s) Physiology, ergonomics
Browse category(ies) Lighting and colour