100 TECHNOLOGY / BENCHTEST
LED Light Engine Module test results compared to website datasheets.
Power Spectral Density (arb.)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
0 380 412 444 LED Modules Power Spectral Densities.
base their new LED luminaires on as there is a significant choice of formats, sizes and options. From the units supplied by the manufacturers the majority of LED modules are still not compatible / interchangeable with each other and therefore product designers will still have to design around specific modules.
One advantage for system designers is most of the modules provided in the test come with a variety of secondary optics options to allow optical beam control for many types of applications. This can save considerable time for a luminaire designer if comple- mentary optics or reflectors have already been designed for the LED modules allowing systems to be placed in the market rapidly. One of the major aspects the luminaire manufacturers will need to consider in the near future will be the challenge that stan- dard LED modules will bring to the market. For example, will standard light engines degrade the individuality or design innova- tion of the fixture manufacturer? If a user is presented with five lighting fixtures, all
having the same LED modules incorporated, where is the product differential? My thoughts are that a purchaser would look to differentiate products based solely on price as there should not be a techni- cal difference between units with similar modules. Of course the lighting industry is not purely based on cost but also reputa- tion, brand value and quality of service. However, losing a technology differentiation tool may mean higher quality fixture manu- facturers may struggle.
It may be that LED modules are a short term phenomenon for lighting manufacturers to leverage products rapidly into the lighting market. However, in the mid-to-long term they will wish to develop their own light engines to enable them to differentiate themselves. In a couple of years from now the thermal challenges currently seen with LED lighting will be significantly reduced as LED efficiencies will have increased to such a high level whilst new electronic skills will have entered into the traditional lighting fixture manufacturers enabling them to be
self sufficient.
Whatever the thought process there cer- tainly is a variety of LED modules available today and if Zharga is successful in the future most will be interchangeable with each other enabling better light engine choice and hopefully a more competitively priced market.
It is important to state that there is cur- rently no long term lifetime data of LED modules and I believe this is going to become the next area of focus for the LED industry. However, it is not as simple as just looking at lumen maintenance data as was shown in typical field data where the LED drivers represented more than 50% of LED system failures.
What will be interesting to study, once these modules are adopted by lighting lumi- naire manufacturers, is how they perform in actual lighting fixtures. Watch this space for further tests of fixtures and different lumen category modules.
g.archenhold@
mondiale.co.uk 476 508 540 Wavelength (nm) 572 604 636 668 700 732 764
Cree LMR4 GE
Philips Xicato
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