As these lamps may differ from the one I used, please use these instructions as a general guide and not an exact procedure.
This should not be attempted by anyone unfamiliar with the safety precautions required when working with high voltage.
After I finished this, I found almost the same thing already on the site By McSensei. However, as mine is slightly different, I will leave it.
I have added a second 20 Watt CFL at the suggestion of lemonie - Now with twice the light