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Lumileds LUXEON Lime LEDs Break 200 Lm/W Barrier

The III-nitride based Rebel ES Lime emitters enable efficient, tuneable white light
Lime, the newest addition to the LUXEON colour portfolio of LEDs from Philips Lumileds enables lighting designers to take the next step in delivering  high quality, tuneable white light in bulbs and fixtures.

LUXEON Rebel ES Lime is the proprietary LED technology in the Philips hue bulb, where it combines with LUXEON Rebel Red - Orange and Rebel Royal Blue emitters to deliver over sixteen million colour options - all controlled from an iOS device. Philips hue can use colour tuneable Light Recipes to help set mood and energy level in the home, office, retail, classroom and hospital environments .

“This really represents a new frontier in lighting, because LUXEON Rebel ES Lime emitters can be combined with other Rebel colour and white emitters to achieve higher CRI and R9 combinations than any previous generation emitters or arrays," says Rahul Bammi, VP of Product Management

Lumileds claims Lime is the highest efficacy LUXEON LED manufactured to date. Therefore it enables highly efficient colour mixing by providing a convenient above - blackbody colour point with optimal standalone efficiency of 200 lm/W at 350 mA and 85 °C. The spectral output of Lime is closely aligned with the wavelength that human eye cones are most sensitive to, 555 nm.

“We are finding that all our customers are very interested in Lime due to the outstanding efficiency and flux it brings to every lighting application," says Bammi .

In addition to LUXEON Rebel ES, the Lime technology is offered in the LUXEON Z format, an undomed, 2.2 mm LED that is 75 percent smaller than most high power LEDs. In spotlight and downlight applications, the LUXEON Z enables tighter packing density and better colour mixing control. The LUXEON Z Lime can be combined with Red and Blue LEDs to achieve a broad spectrum of saturated colours.

Alternatively, tuneable 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 colour temperatures.

For instance, colour tuning of 2250 - 2950K can be achieved with an R9 greater than 90, CRI over 90 and efficacy of 90 lm/W using a LUXEON Z combination.

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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