Descriptors | Metal-vapour lamps, Discharge lamps, Rated current, Testing conditions, Interchangeability, Marking, Lamps, Electric current, Rated power, Electric lamps, Rated frequencies, Voltage, Sodium-vapour lamps, Electric power (wattage), Type testing, Electric ballasts, Rated voltage, Lighting equipment, Electrical testing, Design, Dimensions, Starters (lamps), Starting, Luminaires |