Absolute photometry has relative benefits for LED and SSL performance evaluation
Photometric testing methods are changing in response to the increased adoption of solid-state lighting, explains Ian Lewin.
However, we do not yet know to what extent such devices will become viable in the future as a replacement for existing high efficiency sources; issues such as manufacturability, cost and temperature stability must be addressed. Until these issues are sufficiently answered within the lighting industry, replacement costs and procedures will remain a reasonable concern to commercial purchasers.
Even if today’s SSL performance results are as good as the industry ever produces, a wide range of applications can be satisfied already. With performance increases actually coming at a surprising pace, and with anticipated reductions in manufacturing costs, LEDs certainly appear to be a major light source of the future.
This article was published in the July/August 2008 issue of LEDs Magazine.
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