An examination of 60 mines, 11 illumination hardware manufacturers, and 9 mobile face-equipment manufacturers was conducted to determine the state of the art of mine-illumination hardware, define lighting system installation and maintenance problems, and assess personnel acceptance of lighting. Major problems, with extreme variability in degree, on room-and-pillar installations include damage of exposed components, electrical failures, and reduced lamp life. While most mobile face-equipment operators approved of the machine lighting systems, many complained of glare and other problems. Longwall lighting systems were unanimously accepted by face personnel, and most complaints were minor. Based on survey, general installation and maintenance guidelines have been established, addressing hardware design aspects, approaches proved effective to minimize problems, and noted improper practices that are detrimental to effective lighting.