you can buy tunsten wi
http://www.ebsstore.com/control/prod...oduct_id=TU-T2
I also found a great article on light bulbs at:
http://science.howstuffworks.com/light-bulb2.htm

I believe bulb manufatcurers use rhenium filiments instead of thoriated
tungsten. I think 2% thoriated wire would work but i'm not an expert.
Good luck, sounds like a fun project!

walt