The U.S. Bureau of Mines, U.S. Department of Labor, and United States National Committee of the CIE hosted the TC4.10 Mine Lighting Committee Meeting and Second International CIE Mine Lighting Conference at the MSHA Academy in Beckley, West Virginia, October 12-16, 1981. Discussion during the meeting covered mine lighting instrumentation, opencast (surface mine) lighting, and lighting sources. The committee also reviewed a draft of proposed lighting terminology and suggested changes to make the definitions more acceptable to representatives of the nations present. The papers covered all phases of mine lighting, including research, hardware development and application, personnel acceptance, and requirements for system maintenance. Copies will be available to others interested through the National Technical Information Service. During the TC4.10 Meetings and conference, committee members toured three mining equipment assembly plants, and six of the foreign representatives visited a longwall installation in an underground mine. Planning and administrative services for the meeting and conference were handled by Bituminous Coal Research, Inc., under Bureau of Mines Contract Ho318038.