Amazon.com.au:Customer reviews: B22 to E27 Bulb Adapters 6 Pack Lamp Holder Converter Base Bulb Socket Adapter Converter Lamp Holders Bayonet Cap B22 to E27 ES Edison Screw Converter,BC to ES(B22 to E27)
Does exactly what the description says. We purchased for use with Phillips Hue starter pack which only seem to come in the E27 variety. So far have only used 2 but at least we now have the flexibility to pick up other specials as they come up!
Bought these to convert old fittings B22 in the old part of our house to E27 screw fittings to allow us to use Phillips Hue system. And have been working well for several months. Much cheaper than an electrician!!
Most of the light sockets in my house are the BN (bayonet) format. Most "smart" devices require an ES (edison screw) fitting. Hence I was limited as to my options. or needed to replace fittings. These units overcome this problem.