We are using 6 light bulbs of 100 Watts each underneath the lamp mold to heat up shade and mold, so that the tacking wax gets fluid.
 

When the shade  and mold is warm enough, it will be hung on a chain in the center of the working table and the  mold is

pulled down, while the shade keeps hanging in a distance of just one inch over the table.
 
 
 

You can see the light of the bulbs inside the mold here.
 

The shade is gone here and the mold (which still is rather hot) is cleaned up from the rest of the wax.