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LIGHT + BUILDING / LED REVIEW


Figure 11 The LED Engin ViviLux high CRI Light engine solution.


Cree also launched the XLamp XT-E and XM-L High-Voltage LEDs to provide manu- facturers more efficient, cost-effective components. Leveraging the SC3 technology platform, the brighter XT-E and XM-L High- Voltage LEDs deliver up to 22 percent more lumens than their predecessors. XLamp XT- E and XM-L High Voltage LEDs are designed to use lower cost, higher efficiency and smaller size drivers than standard-voltage LEDs. The brighter high-voltage XLamp XT-E and XM-L LEDs provide comparable performance to their standard-voltage counterparts, eliminating the trade-off of optimszing for either LED efficacy or driver efficiency. LED Engin, a speciality high lumen LED manufacturer from the US, announced Vivi- Lux, a new solution that offers designers a high power density light engine as shown in figure 11. The ViviLux solution offers the following features: • Offered as an emitter / lens combination with beam options: 24° / 35° / 45°; • Industry-leading Lux-on-Target perfor- mance for directional applications; • Colour Temperature of 3000K with 2 Mac- Adam Ellipse single bin for emitter-to-emit- ter consistency; • CRI of 90; R9 minimum of 70; • 85lm/W emitter efficiency measured at Tc=80ºC steady-state. The system achieves the high CRI and R9 values using the same principles as other manufacturers’ that combine white LEDs with Red LEDs. Unfortunately, I don’t see colour sensors to provide accurate colour control so this may be an open loop solution which means colour quality and consistency may change according to thermal manage- ment of different fixtures. However, it is impressive to have 40W of LED power and achieve 85lm/W at Tc=80ºC before the optics. OSRAM announced a range of products. The Soleriq E LED arrays was the stand out prod- uct as it is OSRAM’s first real high perfor- mance LED array offering. The new Soleriq series provides, the first chip-on-board LED from OSRAM Opto Semiconductors as shown


Figure 12 The new Soleriq COB LED array from OSRAM.


in figure 12. Even at high application tem- peratures they create the basis for highly efficient luminaires with a luminous flux of 1500lm to 4500lm. The Soleriq E is available in two versions, covering the entire colour spectrum from 2700 to 6500K. Even at a temperature of 85°C, which corresponds closely to the tem- perature in the application, the two LEDs offer an impressive efficiency of 103lm/W at 4000K. At this temperature the larger Soleriq E45 achieves a typical brightness of 4000lm (rated current 880mA); the smaller Soleriq E30 produces a lumen output of 2700lm (at 600mA). The Soleriq E30 comes in a package dimen- sion of 30mm x 30mm x 1.7mm whilst the E45 package is sized at 36mm x 36mm x 1.7mm. The thermal resistances of the packages are 0.38K/W for the E30 and 0.25K/W for the E45. Good colour homogeneity is achieved by the narrow white grouping of the Soleriq E. As standard the products come in a 4-step MacAdam ellipse option, which is not as good as other LED array manufacturers that offer three-step as standard. However for solutions that need a particularly high level of colour homogeneity, grouping based on two-step MacAdam ellipses is also available. The LED array market is certainly getting exciting and, with OSRAM entering with a COB solution, will offer further quality competition to enable spotlight and down- light solutions to be brought to the market. Interestingly, many Chinese companies have been selling COB solutions for a few years but the colour quality and lifetime of these solutions have been substandard enabling quality LED manufacturers such as Bridge- lux, Citizen and Sharp to gain a foothold in such markets. I believe with, OSRAM’s entrance into high performance LED arrays, the market will start to flourish. Philips Lumileds launched two new LED emitter products at the show: the Luxeon M and Luxeon R. The new Luxeon M emitter has already been approved for street light- ing in major US cities and fixture designs were shown at Light + Building. Luxeon M’s high lumen output - more than 1100 lumens


Figure 13 The Luxeon M LED emitter using 4-LED die in one package.


- and typical voltage of 11.2V enables fixture manufacturers to drive down system costs and improves system performance as solutions are simpler and use fewer parts. The Luxeon M, shown in figure 13, is of- fered in three different correlated colour temperatures - 3000K, 4000K, and 5700K - and delivers more than 1100 lumens with a minimum CRI of 70. Every Luxeon M is hot tested and specified at 85°C and delivers Freedom from Binning. The Luxeon R is an LED emitter designed for outdoor and industrial lighting applications such as streetlights, high-bay lights, wall packs and bollards. It is footprint compat- ible with Luxeon Rebel and Luxeon Rebel ES, while delivering more light output, higher efficacy and better quality of light with a minimum CRI of 70. The Luxeon R is available in CCT’s of 3000K, 4000K, 5000K, 5700K and 6500K with a minimum flux of between 160 – 200 lumens. Samsung, the ‘sleeping giant’ of LED manu- facturing, is now starting to leverage its full vertical integration (from LED materi- als to full product production) and number two position in LED emitter manufacturing. Their product launches must start to send shivers down the spines of the top three global lighting manufacturers. Although, un- til now, Samsung have predominantly used their own LEDs for flat screen TVs (they are now number one in this sector), they have started to create distribution models allow- ing the general lighting industry to access LED emitters and lighting panels worldwide. To put this into context, by April 2011 Samsung LED had over 5500 staff with more than 1500 staff dedicated to R&D represent-


Figure 14 The new Samsung MP36S 0.6W LED emitter.


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