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LEDs surpass 200lm/W efficacy barrier

21 Feb 2014  | Paul Buckley

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Philips Lumileds has revealed that it has surpassed the 200lm/W barrier with the LUXEON Lime LEDs. The LUXEON Rebel ES Lime emitters, according to the company enable the most efficient, tunable white light.

Lime, which is the latest addition to the LUXEON color portfolio of LEDs from Philips Lumileds, enables lighting designers to take the next step in delivering the highest quality, tunable white light in bulbs and fixtures.

LUXEON Rebel ES Lime is the proprietary LED technology in the innovative Philips hue bulb, where it combines with LUXEON Rebel Red-Orange and Rebel Royal Blue emitters to deliver over 16 million color options, all controlled from an iOS device.

LUXEON Rebel ES Lime emitter

Philips hue can use color tunable Light Recipes to help set mood and energy level in the home, office, retail, classroom and hospital environments.

Lime is the highest efficacy LUXEON LED manufactured to date and enables highly efficient color mixing by providing a convenient above, blackbody color point with optimal standalone efficiency of 200lm/W at 350mA and 85°C, stated the firm.

The spectral output of Lime is closely aligned with the 555nm wavelength that cones are most sensitive to in the human eye.

In addition to LUXEON Rebel ES, the Lime technology is offered in the LUXEON Z format, an undomed, 2.2mm2 LED that claims to be 75 percent smaller than most high power LEDs. In spotlight and downlight applications, the LUXEON Z enables tighter packing density and better color mixing control. The LUXEON Z Lime can be combined with Red and Blue LEDs to achieve a spectrum of saturated colors. Alternatively, tunable white light with high efficacy can be achieved from 1800-6500K along the blackbody curve.

Because Lime is closer to the blackbody curve than green LEDs, much less inefficient red is needed to make white light with Lime instead of green, especially at warmer color temperatures. For instance, color tuning of 2250-2950K can be achieved with an R9>90, CRI>90 and efficacy of 90lm/W using LUXEON Z combinations. When using a similar combination of Red, Green and Blue LEDs to create 3000K white light, the CRI is close to 20.

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