The bulb can be lit for about 10 000 hours before it needs replacing. This particular model has a so-called G24d-2 socket, so make doubly sure that it will fit.
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LED Bulbs
Osram 18W Dulux CFL D 2 PIN Daylight - OS487120
Big on Electricals
Osram 18W Dulux CFL D 2 PIN Daylight - OS487120