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LIGHT + BUILDING / LED REVIEW


Figure 15 The 26W Samsung HD72M LED array emitter.


ing more than 15%. Samsung launched the new MP36S series mid-power LED specifically aimed at retrofit lamps and downlights as it is able to reach 130lm/W in 5000K, with full production available by October 2012 in 2700K and 5000K. The package measures 3.6mm x 2.3mm x 0.6mm as shown in figure 14 and is specifically designed for general lighting and to meet LM80 reliability testing. The MP36S has a typical Vf of 6V at 100mA so is a 0.6W LED and offers 70.2 lumens at 2700K and 88 lumens at 5000K. The mid-power LEDs offering up to 130lm/W are ideal for T5 fixture replacements and due to their low costs are highly competitive so should make a big impact. These products have a slightly higher datasheet performance to the latest OSRAM Duris E5 products also due to be released soon. Not to be outdone on high power LED ar- rays, Samsung announced the HD72M series of Chip on Board (COB) solution available from 400lm to 2,600lm in a single LED package. The package dimensions come in at 31mm x 21mm x 1.4mm with 3000K and 5000K options and emitting area 18mm in diameter with a CRI of 80 as shown in figure 15. The typical Vf is 37V with a forward cur- rent of 720mA and the minimum lumens are 1920lm for 3000K and 2120lm at 5000K. The package efficacy is therefore behind those of Bridgelux, Sharp, Citizen and Osram but again it’s a step in the right direction for them. Sharp, another well-known consumer elec- tronics giant, launched a range of new LED products and now have a greatly expanded


Figure 16 The new 10W Mini Zeni LED array from Sharp.


product portfolio with more than 100 LED modules seamlessly covering the brightness spectrum of 5 to 7,000 lumens and a large bandwidth of colour temperatures and high CRI values. The second generation of the 10W Mini Zeni variant now offers even higher efficacy of up to 106lm/W, a greater luminous flux of up to 900lm and is available with a (typical) CRI value of 82. This new product genera- tion is based on the technical advances made in LED production, improving the effi- ciency by up to 47%. Sharp has retained the dimensions of 15 x 12 x 1.6 millimetres as shown in figure 16, along with an aluminium ceramic plate as carrier material. Depend- ing on the model, the new types offer high CRI values of 82 with a long service life of 40,000 operating hours at an operating temperature of up to 90°C in various CCT values. The new generation is specified for use with a forward voltage of 17.7V and a forward current of 480mA. But the arrays can also be operated using a current of up to 800mA, whereby values of up to 1300lm can be reached. The new 50W Mega Zeni models maintain the same compact dimensions and high CRI values, yet with considerably greater luminous fluxes as other LED arrays. The 50W modules have a luminous efficiency of up to 100lm/W, a light output of between 3590 and 4770lm in standard operating mode and a long service life of 40,000 hours at an operating temperature of up to 90°C. The new Mega Zeni modules are designed for a forward voltage of 50V and a forward current of 950 mA, but can also be


Figure 17 The new 50W LED array from Sharp in 82 and 93 CRI options.


operated with a standard power source of 1050mA. Other important features include: R9 values of over 85 with CRI values of over 90; MacAdam 3-step Ellipse binning; and good colour consistency and colour stability values over time under realistic operating conditions (hot lumen). The 50W LED array can thus replace tradi- tional HID lamps in the same performance class. Compared to halogen lamps, the service life of 40,000 hours of the LED ar- ray is notably longer and has a much lower decrease in brightness over time. The round light emitting surface (LES), shown in figure 19, consists of a total of 160 LEDs, sub-di- vided into ten parallel-connected rows of sixteen. The slim design of the new Mega Zeni measures just 24mm x 20mm x 1.8mm with colour temperatures ranging from 2700 to 4000K. The LED arrays are available in a CRI of 93 in 2700 and 3000K and drops to only 92 at 4000K and offers LED efficacy of 76lm/W, 77lm/W and 81lm/W respectively, which is only a 19% drop in efficacy over the 82 CRI range. Xicato launched two new LED models including the XLM 3000 and the XPM Point Module using their cold phosphor solution. The XLM 3000 Artist is Xicato’s highest flux Artist Series product and is designed for ap- plications that require perfect halogen-level colour rendering and smooth, continuous dimming to 0.1% (power). Single-ended T4 and double-ended R7s halogen lamps have been lighting professionals’ first choice for applications such as museums, retail, hospitality, houses of worship and historic spaces. Though their light quality was


Figure 18 The new Xicato XPM spot module enabling high peak intensities.


Figure 19 The Xicato XPM module showing peak intensities for different beam angles.


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