1989IEC 60922:1989 Ballasts for discharge lamps (excluding tubular fluorescent lamps); general and safety requirements
IEC 60922:1989 Ballasts for discharge lamps (excluding tubular fluorescent lamps); general and safety requirements has been changed from IEC 60459:1974 Ballasts for Low Pressure Sodium Vapour Lamps (Edition 1.0; Amendment 1-1976; Amendment 2-1978; Amendment 3-1980).