How long will my bulbs last?

The life expectancy that appears on the lamp box is determined by tests under laboratory conditions using standard testing procedures set by the Illumination Engineering Society of North America (IESNA).

The rated life is set at the time when half of the tested lamps burn out. When lamps are subject to an outdoor environment with changes in temperature, lamp life may be shortened. Other factors such as fixture design and voltage fluctuations may also affect lamp life.

Given this host of variables, it is typical (in a landscape lighting application) that 10,000 hr. lamps last (on average) from 18 to 30 months, while 5,000 hr lamps last from 12 to 24 months. Of course, it's not uncommon for some lamps to burn out in times much shorter or longer than this.

If you feel that your lamps are burning out prematurely, contact your CAST installer to check your lighting system.

For more information, read this article.

 

(Document No. : Created on: 07/09/08 Last modified on: 09/19/08)

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