This energy-efficient light bulb is perfect if you're trying to keep energy costs down. The socket on this bulb is a so-called G24q-1 socket.
From Amazon
Osram Dulux D/E 10 W/840
LED Bulbs
Osram 10W Dulux CFL DE 4 PIN Cool White - OS017587
Big on Electricals
Osram 10W Dulux CFL DE 4 PIN Cool White - OS017587