Bob Darrell proposed an insulated box heated by a 12W bulb and he monitors
temp with a remote-reading thermometer.

When you do this you will likely notice that the temperature climbs
steadily, then holds for a while (perhaps hours), then resumes climbing. 
The place the temp holds steady is the melting point.  When the temp climbs
beyond the melting point, the combs will be done (but pails will need more
time for the heat and melting to penetrate to the center).

Any uncapped honey in the combs might end up very dry and difficult to extract.

A fan is sometimes used inside these hotbox designs to mix the air.

I am a bit leery of having a hot light bulb in a place where wax or honey
could fall on it.  Alden Marshall described a design to me that places the
light bulb above the stuff to be heated and uses a fan and tube to get the
hot air blown to the bottom of the box.

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