It may be that the jack-o-lantern is a single sided mesh, that might "leak". Grab Objaction Twoface from freestuff here, export the jack-o-lantern as .OBJ file, run Twoface on it, and import the resulting object (don't weld the vertices!). Save the imported object to your props library for reuse. Now "light leaking" should be eliminated. P6 point lights should do the job best.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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