Even light bulbs have an energy rating, and this one is G-rated. This particular model has a so-called G23 socket, so make doubly sure that it will fit.
From Amazon
Osram Dulux S 9 W/840, G23
LED Bulbs
Osram Dulux 9W PL-S 2PIN Cool White - 010588
Big on Electricals
Osram Dulux 9W PL-S 2PIN Cool White - 010588