I've spent 6 weeks trying to figure out how to convert my favorite 240v UK bulbs to 120v US. I figured it would be a simple matter of changing outlets - oh damn no! The lampshade design was part of the rosette mechanism and could not be altered. After weeks of searching for 120 volt bayonet bulbs (which don't exist) I was ready to throw them away when I found these. They were delivered quickly - quicker than expected - and screwed directly into the bayonet, allowing the use of an Edison bulb. Then a quick fork swap from 240 to 120 and they fixed it. I'm so glad I found this! Saved me from so much heartbreak. I converted two identical lamps.