A standard version compact shape for high pressure sodium lamps (HS). 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 For luminaires of protection class I (140594, 147707) Z 400M : Aluminium casing with screw terminals 0.75-4mm2 Z 400MK : Plastic casing with screw terminals 0.75-4mm2