MONDO* ARC any letters should be sent to the editor:
26 LETTERS
p.james@mondiale.co.uk
LETTERS
are tested for flux,CRI, CCT and DUV using gelstrings, motors–it’senough t omake yourPROJECTION RESULTS
integrating spheres and spectrometers, and head spin.Dear Editor,
cumulative results are available to customers Now there’s awayto manage everydeviceResponding to Dr. Geoff Archenhold’sarticle
as part of their specification check list. All the on your installation from your
computer.in mondo*arc issue 47, and particularlyto the
test equipment is calibrated against NIST stan- Using industry-standard feedback protocolsreference to the AlphaLED module:
dards and Xicato alwaysverifies test results like RDM (Remote Device Management) and•Weagree with t he disciplined approach of
independently. ACN(Architecture for Control Networks), eachchecking specifications of LED luminaires and
Since lifetime is expected to be 50khrs, per- piece of equipment can send feedback tothe adoption of aUKGovernment strategy
formance over time needs to be addressed. your computer,letting each device essentiallysimilar to the US DOE’s Caliper program. To
Xicato uses the most stringent accelerated ‘talk back’toyo u, telling you when there’s athese ends Projection Lighting’s AlphaLED lu-
lifetime testing copied from the automotive problem.minaires have been submitted to the Lighting
industry:WHTOL (Wet High Temperature But it’s anew technology.And as manufactur-Association for EST approval.
Operating Life test at 85°C &85% Relative ers build it into their products, there hasn’t•Weagree with providing lighting speci-
Humidity;power cycle 1hr. on /1hr. off). The been awayto test these products, to makefiers with acomplete set of realistic data, for
reason this is done is because the combi- sure theytrulymeet the protocol standardexample lumen outputs. Publishing ‘cold’ in-
nation of both temperature and humidity and, just as importantly,work with other RDMstead of ‘hot’da ta is incorrect s ince it does not
accelerates degradation. Results have now ex- and ACNproducts.reflect performance at actual operating condi-
ceeded 3000hrs and degradation is less than Anew global nonprofit organisation hopestions and as such has caused confusion and
one percent in our worst case. US EnergyStar to change that. The Institute for Feedbackpossiblyeven aversion. It is for that reason
requires less than 8.2% for indoor applica- Excellence, launched in April, aims to providethat Xicato specifies acomplete set of product
tions at 6000hrs, which is of course at regular atesting process for lighting devices that usedata at 70°C, which is the recommended test
operating conditions. these protocols. This way,customers that buypoint temperature on the module. Projection’s
Finallythermal analyses confirmed byactual feedback-enabled equipment can know withAlphaLED luminaires are designed at an am-
testing for all AlphaLED luminaires using a certaintythat equipment from different manu-bient of 30°C to run at these conditions.
combination of CAD and Thermal Simulation facturers will work together –just like theydo•Challenges in perfecting Remote Phosphor
software optimises integrated thermal design now with DMX.based LED modules to ensure CCT and CRI
of the AlphaLED luminaire in such awaythat The test uses three main devices: the Ent-consistencyare correctlydefined and these are
module test point temperatures of 70°C are tec RDM Sniffer,the Enttec Controller,andexactlywhat Xicato (the module manufacturer)
achieved in an ambient of 30°C. This can be the Wybron Infogate gatewayand
software.is focused on. Xicato uses acombination of
directlyrelated to, and is well below,the max Together these devices test the qualityof thetechnologies to ensure that each product emits
LED junction temperature. This results in the RDM signal to make sure it conforms to theuniform and consistent light with the right CCT
junction temperature being lower than those RDM standard as dictated byESTA. The de-and CRI values, one of them being acon-
prescribed byLED manufacturers with respect vices also determine whether an RDM devicetrolled phosphor deposition process: Xicato’s
to their L70/B50figures, ensuring the life time would be compatible with another piece ofproprietaryCold Phosphor Technology.On
of the LED themselves as thus the fixture. RDM equipment.top of that, and more importantly,itkeeps the
We believe, stemming from the above tech- The IFE test process can be performedphosphor cold. Dr.Archenhold correctlystates
nological details, that the AlphaLED luminaire anywhere in the world. Manufacturers canthat phosphor efficiencyand lifetime degrade
range offers aunique lighting solution, and conduct the test on site byhavingthe test labas temperature increases. Due to the unique
that Dr Archenhold is too conservative in shipped to them, along with acomprehen-integral thermal design of the modules, the
estimating that it will take one or two years sive document outlining each step of the test.heat generated bythe phosphor when it con-
before “...we will see LED fixtures accelerate (Download this test document at www.fbexcel-verts high energylight to lower energylight
into the general lighting market”. Viable LED
lence.org.) Alternatively,manufacturers canis instantlyremoved from the phosphor itself
luminaires are available today. send equipment to one of the IFE testing labsresulting in alower operating temperature of
Regards, located in the U.S. and Australia.the actual phosphor.Phosphor temperatures
GaryHeald, Projection Lighting There’s alot of exciting work being done withare significantlybelow 100°C (as low as 70°C)
Roger Sexton, Xicato RDM, but it’s going to take cooperation fromwhile regular white LEDs operate the phos-
manufacturers across the industryto reallyphor at an estimated temperature well above
(read Dr.Archenhold’s replyat make it beneficial to the end use.100°C (up to 140°C). The combination of
www.mondoarc.com/technology/LED/) The RDM standard has the potential to reallyboth is what Xicato calls Cold Phosphor Tech-
transform how the industrythinks about light-nologyand it ensures the best possible colour
EXCELLENT FEEDBACK ing control systems, but this won’t happen ifconsistency:within the products, product to
Dear Editor, we don’t all pull together and harmonise theproduct and over time.
Maintaining an entire lighting installation isn’t implementations.Moving to results -thousands of modules have
an easytask. When you consider the hun- Regards,been produced within acolour point specifi-
dreds of pieces of equipment –light fixtures, Henrik Dyre Pedersen, Martin Professionalcation of almost 2SDCM, with CRIs over 80
dimmers, power supplies –inaddition to KenyWhitright, Wybronor over 90,depending on the specification
the multitude of parts inside them –lamps, JeremyKumin, Enttecof the module. 100%ofthe Xicato modules
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