Metal halide lamps with ceramic technology for enclosed luminaires. Product features: POWERBALL© ceramic technology. Light colors: warm white (930 WDL), neutral white (942 NDL). Color rendering index Ra: 90. Average lifespan: 20,000 hours (when operated on an electronic ballast with 70,400 Hz square wave current). Average lifespan: 15,000 hours (when operated on a magnetic ballast). Average lifespan: 16,000 hours (35 W/942 with electronic ballast 70,400 Hz square wave current). HCI-T 50 W only for operation on an electronic ballast with 70,400 Hz square wave current. Product advantages: Very high efficiency. Very good color rendering. Very long lifespan. Very good color stability. Thanks to the UV filter, the maximum permissible UV limit values according to IEC 61167 are significantly undercut. Areas of application: sales rooms, shop windows, shopping arcades. Foyers, reception halls. Museums, exhibitions. Exhibition and trade fair halls. Industrial and commercial halls. Only approved for use in enclosed luminaires. Outdoor applications only in suitable luminaires.