There is not enough pictures from the step by step, but I will post this instructable anyway, to give you an idea of what can be done. Some pictures are old advertising.
Step 1: Dismantle the Floor Polisher
(Mine will be used to a grind.)
Get the dome of floor polisher. That will be our lamp.
Measure the diameter of the socket.
Draw a circle with the diameter of socket into the dome.
Using Dremel, cut the circle and sand the hole.
Step 2: Make the Dome Look Pretty
Remove the dust of sanding.
Paint the interior of dome with automotive paint. I painted of white, to better reflexion of light.
If you like, paint the exterior too. I painted of red color, because my floor polisher was beige color.
Step 3: Finising
Connect the lamp to your grid.
Put the lamp in the socket.
Turn on the light!