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Mining Publication: Effects of Light Spectrum on Luminance Measurements in Underground Coal Mines
Keywords: Lighting
Original creation date: November 2019
Authors: M Martell, J Sammarco, B Macdonald
Peer Reviewed Journal Article - November 2019
Go to Web Page
NIOSHTIC2 Number: 20057402
IEEE Trans Ind Appl 2019 Nov-Dec; 55(6):6670-6677
Lighting regulations for luminance in U. S. coal mines are verified in the field by using a luminance photometer calibrated to the Standard Illuminant A light source. Significant measurement errors can exist when measuring light sources that are dissimilar to light sources used to calibrate the photometer. This paper quantifies the measurement errors when measuring these dissimilar light sources commonly used in U.S. underground coal mines—an LED, a CFL with a clear cover, a CFL with an amber cover, and a tungsten halogen. The impact of photometer quality was also evaluated. Three different luminance measuring instruments of high, medium, and low quality were compared—a PR-650, LS-100, and PMEX, respectively. The PMEX was under evaluation for measuring luminance compliance in U.S. underground coal mines. The PR-650 was used as the referent to which the other photometers were compared. The PMEX error ranged from −17.0% to −26.5% with the highest error for the amber CFL. The LS-100 closely matched the luminance measurement for the LED and halogen; however, it had a percent error of −10.4% for the amber CFL. After the initial experiment, MSHA made improvements to the PMEX resulting in the PMEX-MSHA. The experiment was replicated using the new photometer and the newer PR-670. After repeating the experiment, the measurement errors ranged from −16% to −19% for the PMEX-MSHA, thus indicating an improvement over the PMEX. These results show that the spectral content of a light source and the photometer quality can greatly impact the accuracy of luminance measurement.
First page of Effects of Light Spectrum on Luminance Measurements in Underground Coal MinesPeer Reviewed Journal Article - November 2019
Go to Web Page
NIOSHTIC2 Number: 20057402
IEEE Trans Ind Appl 2019 Nov-Dec; 55(6):6670-6677
See Also
The Application of Fiber Optics Technology to the Design of Mine Lighting Systems
Computer Design and Evaluation Tool for Illuminating Underground Coal-Mining Equipment
Crewstation Analysis Programs - An Easy to Use Personal Computer-based Lighting and Visibility Analysis Software Package for Underground Mining Equipment
Evaluation of Mine Illumination Systems Using Numerical Modeling
Evaluation of Visual Performance When Using Incandescent, Fluorescent, and LED Machine Lights In Mesopic Conditions
Identification of Potential Roof Problems Using LED Lighting & Numerical Modeling of Highwall Stability Using FLAC3D
The Potential Impact of Light Emitting Diode Lighting on Reducing Mining Injuries During Operation and Maintenance of Lighting Systems
Underground Coal Mine Lighting Handbook (In Two Parts): 1. Background
Underground Coal Mine Lighting Handbook (In Two Parts): 2. Application
Underground Coal, Metal, and Nonmetal Mine Illumination Systems for Improving Miner Visual Performance
Page last reviewed: May 21, 2020
Page last updated: May 21, 2020
Content source: National Institute for Occupational Safety and Health, Mining Program
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