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A relation between mass loss and life of incandescent filament lamps

¹ Department of Farm Engineering, Banaras Hindu University, Varanasi 221005, India
² Department of Physics, Banaras Hindu University, Varanasi 221005, India

^* To whom correspondence should be addressed. E-mail: dca_bhu{at}yahoo.com.

	Abstract

The thermodynamics of a radiating and evaporating tungsten filament having a hot-spot defect are examined theoretically. Assuming quasi-steady-states for the main and the hot-spot segments, the time profiles of their temperatures and radii are derived in closed form. Explicit relations among the fractional mass loss, failure time and defect size ratio are obtained and compared against approximate expressions used by Gluck and King⁷ and by Elenbaas.¹⁴ Numerical results computed for vacuum lamps support our theory.

First published on July 22, 2009
Lighting Research and Technology 2009, doi:10.1177/1477153509104616


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