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TECHNOLOGY / LED
material and device structure chosen, OLEDs can be transparent, have a diffuse appearance or behave like a mirror in the off state. For Novaled’s commercially available OLEDs (up to 15x15 cm active area) they currently confirm around 20 lm/W efficacy.
Figure 7: OSRAM’s Orbeous OLED Lighting panel Figure 8: Toshiba’s E-core LED bulbs
GE: show off their latest OLED panels that are 75mm x 150mm in size and offer 28 to 30 lumens per watt in high CRI and various CCT versions. The research and development partnership between GE and Konika Minolta seem to be bearing fruit as 30 lumens per watt is a step further than most OLED manufacturers can achieve. GE believes that they will have a significant lead compared to other OLED entrants as they will produce the OLED panels on a roll-to-roll process similar to newspaper printing which will enable them to produce high performance, low cost devices when commercialisation starts next year. Most of the other manufacturers of OLED panels are produced using a different technique which spins or vacuum coats a glass or plastic plate which is more expensive and time consuming to produce.
Figure 9: The Philips Endura 60W LED light bulb equivalent
production.
OSRAM: demonstrate their OLED offering in the form of the Orbeos panel shown in figure 7 offering a thin (2.1mm), 79mm diameter warm white (2800K) light source with a CRI of 75 and an efficacy of 23 lm/W. A maximum luminance of 1000cd/ m2
is achieved at 186mA forward current providing a lifetime of 5,000 hours.
Novaled: demonstrate a complete booth at Light and Building of OLED type fixtures and light engines providing a very high quality light with a CRI of up to 95. A range of OLED lighting from warm white to clear cold white was also exhibited including colours such as deep orange, rich red and intense blue. Colour tunable OLEDs that cover a broad span of colours from light blue through clear white and all the way to orange are also launched.
The OLED devices which are manufactured on glass and metal substrates, are extremely thin, lightweight and come in various sizes from 25cm2
up to 225cm2 active area. Depending on the substrate
The battle of the LED retrofit bulb begins A real battle begins during Light+Building with the LED retrofit bulb sector becoming a hugely congested one. As described on many occasions, LED retrofit bulbs are very difficult to manufacture reliably because they have a limited space envelop in which to dissipate heat and that usually translates to poor optical performance compared to traditional light sources and decreased reliability because of high driver temperatures (one reason why AC LEDs may dominate the retrofit sector). However, the battle lines are being drawn between traditional lighting companies like GE, Philips and OSRAM and new global brands including Panasonic, Toshiba and Verbatim as well as smaller LED companies such as Lighting Science Group.
Verbatim: their first family of lamps based on a blue light-emitting chip LED technology are available in cool and warm white, and have a typical colour rendering index (CRI) similar to that of other products. The next generation of lamps, planned for 2011, will use a violet light emitting chip with red, green and blue phosphors. These products, also in warm white, will offer further improvements in CRI with a typical average value of 98.
Toshiba: officially enters the European lighting market with the launch of the E- Core LED product line, consisting of lamps and a high-efficiency LED downlight fixture line. The lamp line, which includes six reflector lamps in three colours and two
A19 bulbs in two colours, features high brightness and energy efficiency in compact designs. The downlight line includes six models available in four colours, in which the brightest model reaches a luminous flux of 1250 lumens. Toshiba also demonstrates several technology prototypes including LED bulbs with a 1690 lumens performance and a 260-degree lighting angle, and GX53 self- contained round units with a total luminous flux of 2000 lumens.
The LED retrofit bulbs, shown in figure 8, are offered in a variety of lumen outputs however the 2700K 9W lamp offered 600 lumens providing an impressive efficacy of 67 lm/W whilst the 4000K 9W version provided 78lm/W. More impressively is that these total flux measurements were taken after the light bulbs had been switched on and off 40,000 hours. The LED light bulbs also have a minimum 80 CRI.
Panasonic: launches its LED bulb retrofit range with high efficacies. The LED bulb LDA7L-A1 is 107mm long and 55mm in diameter with a CCT of 2700K and up to 40,000 hours lifetime. The bulb produces 360 lumens by using only 7W of power to give 51 lm/W efficacy whilst the 6700K version produces 460 lumens or 66lm/W. In addition to the LED light bulb replacement, Panasonic launches its GU5.3 and GU10 LED retrofits. The warm white MR16 version has a 2700K CCT and provides 150 lumens in only 4W providing 37.5 lm/W increasing to 50lm/W for the 3000K version. Panasonic states that lifetimes for the MR16 range is 25,000 hours.
GE: launches its LED GLS Lamp consuming only 9 Watts of power and providing a true 360 degrees of light output mimicking a standard 40W lamp. The new light bulb was in US stores from August and the LED bulb produced 450 lumens for a total of 77 percent in energy savings. Unfortunately, the price looks to be in the $40 to $50 range and provides 25,000 hours of light. GE are using the Cree-XPG LED emitter in the new lamp.
Lighting Science Group: announce the DEFINITY line, a 9 watt LED A19 bulb that will retail in the low $20 range (~£13) and is a direct replacement for 40 watt incandescent bulbs. The DEFINITY LED bulb provides a stunning 770 lumen output which is 80% more efficient than a 40 watt incandescent bulb, will last close to 23 years and provides 85.5 lm/W in warm white variants. This new LED bulb seems to be a significant step ahead of the competition in both technical and commercial offerings and this has been validated by the largest home retailer in the USA, Home Depot, that has already
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