Mining Contract: Solid-State Helmet-Worn Mine Lighting Systems
This contract will (1) determine human factors related to dark/light re-adaptation, tripping hazards, and glare; (2) survey electronic current regulation methods for LED drive circuitry; and (3) determine the effects of battery discharges and temperature changes on LEDs. It will provide NIOSH with information to evaluate solid-state lighting system designs and prototypes for cap lamps.
Contract Status & Impact
This contract is divided into three tasks:
- Outlining Human Factors Research. The Lighting Research Center (LRC) project team will summarize previous research studies and literature on the visual benefits of peripheral illumination, including information on visibility of potential tripping hazards, relative visual performance calculations, miners’ re-adaptation when looking outside a focused, spot beam to regions of relatively low luminance, the impacts of peripheral illumination on disability, and discomfort glare. The memorandum will include sketches and brief descriptions of a series of experiments that could be performed to investigate these issues.
- White Paper on Solid-State Lighting System Operating Methods. The LRC will develop a white paper report outlining various methods for operating solid-state lighting systems (in the context of helmet-worn mine lighting systems). The paper will provide NIOSH with information to evaluate solid-state lighting system designs and prototypes for cap lamps.
- Determining Battery Discharge and Temperature Effects. The LRC will determine the photometric, spectral, and electrical characteristics of two LED cap lamps and an incandescent cap lamp as the battery is discharged over 12 hours as a function of the following ambient temperatures: 22°C, 30°C, and 40°C.