The bulb can be lit for about 10 000 hours before it needs replacing. The socket on this bulb is a so-called G24q-2 socket.
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Bell 18watt G24q-2 4pin Colour 840 Cool White PLC
OnBuy
4x 18 watt CFL 4 pin Energy Saving Lamp 18W Cool White 840 G24q-2 Double turn