131 lamp replacements.
Major breakthroughs on LED efficiency of note were those of Citizen, Cree, OSRAM, Epistar, Nichia and Philips, all of whom announced volume production LED emitters that consistently broke company or industry lm/W records. Interestingly, the strategies among LED manufacturers have varied this year as many of them differentiate themselves from their competitors with many of them focusing on the following:
1) High efficacy, high wattage LED arrays - These were introduced primarily by Citizen, Bridgelux and Sharp to replace halogen, HID and CFL for retail and downlight applications. 2) AC LED emitters - Philips and Seoul Semiconductor have launched or upgraded the AC LED emitter offerings primarily for low-wattage traditional lamp replacements due to less onerous driver requirements. 3) Standard LED emitters - OSRAM, Philips, Nichia and Cree all updated their performance for white and coloured LEDs during the year covering general applications. 4) Large Die LED emitters - Cree, Philips and Luminous Devices upgraded their large die offerings to provide high optical power density light sources focusing on MR16 and spot type applications as well as high optical power applications. 5) High voltage/low current LED emitters - A new class of LED emitters specifically for reducing the LED driver burden with currents up to 30mA used specifically for light bulb/tube replacements. The year ended on a significant high with Cree announcing the new range of high- CRI LED XP-G emitters that offer a CRI of 80, 85 and 90 without compromising LED efficiency. Such breakthroughs in phosphor and LED packaging performance will now enable the last areas of lighting to fall under the influence of LED fixtures. Finally, the sheer engineering prowess of Citizen has enabled them to launch a 26W and 41W LED array containing multiple LED dies that have the same efficacy performances (73lm/W for 3000K and 105lm/W for 5000K) as a typical single 1W LED emitter in both 3000K and 5000K CCT. In many ways 2010 was a historic year for the LED and lighting community and so we shall cover this year’s innovation on a month-by-month basis.
FEBRUARY Bridgelux: unveils three new LED array product families (see figure 1) that deliver high-quality, energy-efficient light sources. These new products are designed to replace incandescent, halogen, high intensity discharge (HID) and compact fluorescent lighting.
Figure 1: The Bridgelux RS and LS high power LED arrays
• The Bridgelux ES Array Series delivers between 400 and 2000 ‘hot’ lumens in a compact high flux density light source, enabling the replacement of incandescent, halogen and fluorescent conventional light sources. These new arrays are 30-60% more energy-efficient than 2009 models while dramatically reducing the price per lumen. • The Bridgelux RS Array Series delivers high light output for applications including retail, street, wide area, high bay, and commercial lighting, replacing conventional light sources such as 50- 70 watt metal halide (HID) and high wattage compact fluorescent (CFL) lamps. These arrays produce between 3100 and 4500 ‘hot’ lumens. In retail lighting installations, these arrays have delivered a return on investment of less than two years while delivering the high quality of light proven to positively influence product turnover and customer experience in this environment. • The Bridgelux LS Array Series is a new set of miniaturised LED arrays that enable both diffuse and directional light sources for applications including landscape lighting, home luminaires, white goods and retrofit light bulbs. Delivering between 240 and 360 lumens, these products are ideal replacements for low wattage halogen, incandescent and CFL lamps.
Cree: raises the LED performance bar for both white and coloured LEDs: • Launches the XLamp® MPL EasyWhite LED to offer the performance, colour consistency and lumen density required to displace conventional light sources, all in the industry’s smallest package.
The multi-chip XLamp MPL EasyWhite LED is optimised for directional lighting applications, including PAR- or BR-style light bulbs. The new package delivers up to 1500 Lumens at 75 lumens per Watt based on a compact 12mm x 13mm footprint. • Announces the record R&D efficacy result of 208 lumens per watt for a white power LED. Cree’s tests confirmed that the LED produced 208 lumens of light output and achieved 208 lumens per watt efficacy at a correlated colour temperature of 4579K. The tests were conducted under standard LED test conditions at a drive current of 350mA at room temperature. • Raises Performance Levels for XLamp XP LEDs including the commercial availability of higher-flux bins for warm- and cool-white XLamp XP-E LEDs and higher maximum forward currents for both XLamp XP-E and XP-G LEDs. XP-E cool white LEDs were available in the R3 bin, 122-130 lumens at 350 mA, delivering up to 116 lumens per watt. Warm-white (3000 K) XP-E LEDs were available in the Q3 bin, 94-100 lumens at 350 mA. The maximum forward current for all XLamp XP-E white LEDs were increased to 1 A whilst the maximum forward current for XLamp XP-G LEDs was raised to 1.5 A, delivering up to 493 lumens at 92 lumens per watt. XP-G LEDs deliver high efficacy at high currents.
Xicato: launch the ‘Artist Series’ spot module range - a functional replacement for traditional halogen lamp technologies with a CRI of 95, offering all the life and energy-saving advantages of LEDs with no light-technical or aesthetic compromises.
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