Currently the tungsten filament in our QEMSCAN system Camborne School of Mines, University of Exeter, UK has been running for 6376 hours (since 15th December 2011) which is well over 8 months. Is this a record for tungsten filaments? Comments welcome on life spans of your filaments!
The filament was finally removed during a service after an impressive 7771.46 hours of life, and, was still operational, after being in the instrument a little short of 11 months.
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