Part of me wishes this was a fake as it makes my own pumpkin carving attempts look like they were done by a 3 year old, but I think we just have to accept that he has way more skill and devotion to pumpkin carving than most of us ever will.
He has a deviant art page with a few more pumpkins from over the years
fredfunkey's deviantART gallery Gallery of more pumpkins:
Artisan Crafts by fredfunkey on deviantART He uses a light bulb for the interior and said on one of them that a dremel was the main tool for the carving.
The light bulb gives a much nicer illumination then a candle, but is perhaps a little less exciting then camping stove fuel (recklessness is the poor man's substitute for creative skill):