This is a lamp from Endon Lighting which is fitted with an E27 socket. This lamp is first and foremost intended for indoor use and 40W is the maximum recommended wattage for bulbs.
From Debenhams
Obi 1 Light Up & Down Wall Light Vintage White Linen Polyester Cotton E27 - One Size
Massive Lighting
Endon Obi 1lt Wall 40w 70335 By Massive Lighting
This product is also available at 1 unverified store.