Photograph showing (top)MSHA-approved LED headlight illuminating a mine entry and (bottom)the same mine entry illuminated by the Jupiter 2 light. There is a wider pattern of light shown in the Jupiter 2 image.

The existing illumination provided by a traditional LED headlight (top), as compared to the improved illumination provided by the NIOSH-developed Jupiter II Wide Area Light (bottom). Photos by NIOSH. (click for larger image)

The NIOSH Mining Program conducts mine illumination research to address the visual needs of the aging miner workforce and to improve miner safety by reducing glare and improving a miner’s ability to see mine hazards associated with slip, trip, and fall events and moving machinery accidents. This research enables improvements in mine lighting so miners can better see hazards, thereby reducing the potential for accidents. One result of this research is a light-emitting diode (LED) area light called the NIOSH Jupiter II Wide Area Light.

NIOSH developed the Jupiter II Wide Area Light wide area light for roof bolters and the illumination of working areas. The design objectives were to maximize area illumination while reducing glare. Manufacturers and mine operators can mount the Jupiter II in a variety of positions on equipment and in general work areas. The top photo shows the illumination from a typical LED machine headlight used on mining machines, and the bottom photo shows the increase in illumination from the Jupiter II.

Specifications Summary

Total output 1664 lumens (lm)
Efficacy 78.1 lm/watt
Maximum candela 983 candela
Voltage 120 volts AC
Current 0.1854 amps
Power 21.29 watts

Downloading the Documentation

Photograph of the plan view of the Jupiter 2 wide area light

Jupiter II Wide Area Light (click for larger image)

The downloadable ZIP file includes a PDF describing a functional overview of the Jupiter II Wide Area Light, a README file, and numerous individual software and schematic files created by NIOSH or NIOSH partners in this research. The CDC's Technology Transfer Office has approved the public release of these files.

NIOSH Jupiter II Wide Area Light

For further information about NIOSH illumination research or working with the downloaded documentation, contact NIOSH Electrical Engineer John Sammarco at 412-386-4507 or

Page last reviewed: December 11, 2019
Page last updated: May 9, 2019