This report describes the evaluation of various light souces for use in a fiber-optic lighting system for mining machines. Metal halide arc lamps were found to work best because of their resistance to damage from shock and vibration and the high luminance of the arc. Measurements were made of the percent transmission of the 1/2-inch- thick glass window and the fiber bundles, the total lumen output of the diffuser assembly with a known input, and the average surface luminance of the diffuser assembly. These data were then used to calculate the theoretical output of the system given an estimated input from the source. A prototype 55-watt, single-ended metal halide source was then developed. In order to provide greater efficacy and higher throughput through the fiber-optic cables, a variation of the lamp with thallium iodide added to the fill was developed. The lamp was modified, and a ballast was developed to allow it to hot restrike.