Standard version or with automatic switch-off Compact shape For high pressure sodium lamps (HS), metal halide lamps (HI) and ceramic discharge lamps (C-HI) Ignition voltage: 4–5 kV Phasing of the ignition voltage: 60–90 °el and 240–270 °el Max. permitted casing temperature: 105 °C Fastening: male nipple with pre-assembled washer and nut For luminaires of protection class I and II