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Airfield Lighting
The long-term
performance of LEDs
Jean Paul Freyssinier provides a detailed summary of the
Lighting Research Center – Rensselaer Polytechnic Institute’s work on
understanding the useful life of airfield LED luminaires
In just the past few years we have seen light-
generation LEDs were able to provide suitable
makers because it can translate into more
emitting diodes (LEDs) make impressive
solutions compared to traditional
reliable operations and reduced maintenance
progress in terms of light output, colour
incandescent sources. Thus, with the potential
costs, especially considering the demanding
properties, efficacy (measured in units of light
to improve visibility to pilots (see ‘LEDs and
conditions found in airports. However,
(lumens, lm) per electric watt, or lm/W), and
human factors’ on page 40), energy savings,
LED luminaires (fixtures), and in particular
potential for long life. These improvements,
and long life, airports throughout the world are
airfield luminaires, are relatively new to the
paired with significant reductions in costs, have
transitioning to LED-based solutions at an
market and no sufficient long-term performance
resulted in many more applications using LEDs,
increasing rate 1,2 .
test results are currently available 2 . Notably, at
from consumer electronics to cars to general
illumination indoors and out.
For aviation lighting, the use of LEDs has
Now that the light output and efficacy of
LEDs has met or surpassed those from other
this time there is no definition of ‘useful life’
specific to aviation lighting products.
light sources, the focus in most applications,
always been a sensible option because LEDs
including aviation lighting, has shifted to other
are particularly suited for applications in need
important issues, such as long-term
Why do we need a definition
of useful life?
of coloured light and because signals and
performance, system reliability, and initial
While LEDs could last for many thousands of
other visual aids in airports do not require
cost. The potential for long life is particularly
hours under certain conditions, the life of
much light output necessarily, so even early
relevant to airport administrators and decision-
the LED itself, and more importantly, that of
38 Volume 18 · Issue 2 · 2014 www.internationalairportreview.com