Get a regular lamp, you'll have to trust your own judgement on how close and hot you'll allow things to get. Angle the figure towards the heat. Cover up the card and areas of the bubble and figure you don't need exposing to the heat, under your supervision let the heat work its magic!
I did a 12 back earlier for the first time. It's not sunlight that evaporates the frosting, it is purely down to heat.
See before and after pics of severe frosting which took around 2 hours. Good luck!!