Electronic ballasts for ring lamps TR16-lamps Ø 16mm tube TR26-lamps Ø 26mm tube TR29-lamps Ø 29mm tube TR32-lamps Ø 32mm tube Variants one lamp several lamp dimmable various voltages 230V AC/DC 110V AC/DC 60V AC/DC 42V AC/DC 24V AC/DC 24V DC 12V DC different formes