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Replacement rate of filament lamps in an organization: A rule of thumb

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

We address the issue of renewal rate of fused filament lamps in an organisation and modify the description given in an old edition of the IESNA Lighting Handbook (1968). This is achieved by applying the standard mortality curve to formulate an exact algebraic relation for the renewal fraction at successive stages. Finally, for the benefit of illuminating engineers a rule of thumb is developed, which estimates the saturation number of lamps to be replaced as a function of burning time, half-life and the total number of lamps installed.

First published on June 26, 2009
Lighting Research and Technology 2009, doi:10.1177/1477153509103409


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