LIFX bulbs are available with E26 screw, or E27 screw fittings. There are also bulbs in the B22 'bayonet' type connector available.
It is possible to use 3rd party adapters, such as an Edison screw to bayonet adapter. This is NOT recommended, though, and will void your warranty.
We recommend that LIFX is always be used in light fittings that have been installed by a qualified electrician or in plug-in style lamps that have been fully certified for use in your region.