This is a very energy-efficient bulb, perfect if you're trying to keep energy costs down. The socket on the bulb is the quite common E27 socket, also referred to as an intermediate socket.
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OSRAM 4058075607347 LED (monochrome) EEC E (A - G) E-27 Battery shape 7.3 W = 60 W Warm white (Ø x L) 32 mm x 90 mm 1 pc(s)