So to the internets we went. Thanks to the magic of YouTube we found this video which helped us create our own contraption.
We used this mat found in our basement as the base for the contraption. This will protect the light from the moist ground.
A work light from the hardware store + a 75 watt bulb is the main source of heat.
Place the light on the mat and the pot over the light. The clay pot will help retain the heat.
Don't try this at home!
Blackberry went straight for the foil which resulted in me taking it apart again and trimming the foil.
I am happy to say we tested this out last week when the temps got below freezing and it worked beautifully.