108 TECHNOLOGY / STREET & AMENITY LIGHTING
TRILUX CONVERTS TO LED
For more than 20 years, the TRILUX 935•••
construction series has been a best seller. With its
clear and unostentatious shape, it has become a
design classic found in many streets and squares.
Now the luminaire can be fitted with LEDs by a
conversion kit meaning existing systems can
easily be converted within a few minutes. The
system has many benefits including 60,000 hours
life time and a low maintenance service period.
In addition, light from the LEDs does not attract
insects meaning less dirt will enter the luminaire.
The optical system of the conversion kit consists
of three or four segments, each with 18 or 24 high
performance white 1W LEDs with a total luminous
flux of up to 2,400lm.
Two of the four LED segments can be switched off
separately for the enrgy-efficient lowered night-
time lighting.
With a few simple touches the necessary
components for the LED conversion are
exchanged - ideal for quick and low-cost
renovation of existing systems.
www.trilux.co.uk
demonstration installations of LED street sodium-lamp equivalents, the LED street streetlight maintenance, to save $1 million
lighting that have been funded by local, lights will begin to fall significantly short on each year in energy costs and $700,000 in
regional or national governments across the efficiency performance due to the thermal maintenance costs with LED lighting.
world to benchmark the real performance heating issues of so many LEDs and so there The report goes on to say that for now,
of LEDs in the application. are still significant challenges for LEDs to induction lighting holds a slight edge over
One such demonstration project was funded meet in the foreseeable future. LED lighting in environmental issues, costs
by the Department of Energy in the US and There are currently several other and other factors.
they published a report in November 2009 benchmarking studies being undertaken
on the installation of LED residential street and so the industry should be able to gain CONCLUSIONS
lighting in Portland, Oregon. This GATEWAY further information of real-life performance It is clear that LED technology will begin to
demonstration report provides an overview of LED street lighting over the next few dominate the street lighting scene over the
of project results including lighting years. next decade and 2011 will be the tipping
performance, economic performance, and The interesting point to note when point for mass adoption (rather than trial
potential energy savings (www.ssl.energy. reviewing these studies will be what LEDs sites) for LED street lights.
gov/gatewaydemos_results.html.). they have used in the lighting fixture head Even with significant improvements in LED
In this project, eight 100-watt (nominal) because the information being published performances and a reduction in costs there
high-pressure sodium cobra head fixtures will be significantly out of date as LED is only a compelling reason to change to
were replaced with LED street light technology is improved on a six to twelve LED streetlights if the current lighting stock
luminaires. Key findings from the study month cycle so most of the reports will is due for replacement. In my opinion it
include: be based on last years technology! This is would not be a good use of scarce public
• Estimated payback was approximately 7.6 always going to be a challenge for the end- resources to replace traditional light source
years for new installations and 20 years for user as they have the very hard decision streetlamps that have been replaced in the
replacement scenarios. of whether to opt for the technology last decade as there is little or no efficiency
• While measured energy savings were today or wait twelve months and adopt gains from using today’s LED products.
significant at 55%, they were primarily much improved technology with higher I certainly feel that there will be strong
achieved through reducing average efficiencies and longer life. merit to convert all street lighting over to
illuminance levels by 53%. Illumination now Further studies include those from Ann LED products in the next decade and its
more closely meets the level specified by Arbor city government which have taken a clear that the market will start to accept
the city for residential streets. very proactive stance promoting LED usage. LED products over the next few years.
• Ten of eleven respondents in the resident The city has created a whitepaper (www. geoff@euroled.org
survey either noticed no difference or a2gov.org/government/publicservices/
thought the lighting quality was improved systems_planning/energy/Pages/
following the LED substitution. LEDLighting.aspx) and states a goal of Geoff Archenhold is an adviser to the
The results of the study show that energy cutting the streetlight energy bill in half. UK Government on LED technology and
savings can be made but the savings The university’s Mascaro Center for helps LED companies raise investment
correspond to a near linear reduction in the Sustainable Innovation has recently from the finance community. He is an
average illuminance levels. Therefore, this completed a 72-page in-depth study investor in an LED driver company and an
shows that in practice the system efficiency on LED streetlights entitled ‘Life cycle LED fixture company, a Lighting Energy
of LED street lighting in 2009 was roughly assessment of streetlight technologies’. Consultancy and euroLEDs Events LLP.
equivalent to that of traditional lamps The report recommends that Pittsburgh
for low power 100W high-pressure sodium replace its 40,000 streetlights with LEDs The views expressed in this article are
lamps. Of course, when higher power which would allow the city, which spends entirely those of Geoff Archenhold and
street lights are required eg; 200W or 400W $4.2 million annually on electricity and not necessarily those of mondo*arc.
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