LED drivers Phosphor technology - Beriled

Lumination‘s VIO LED also provides high efficiency at warmer color
temperatures, as well as flexible color temperature and color–rendering
options.
Lumination scientists create VIO high–power white LEDs by combining
405 nanometer violet chips with a proprietary blend of phosphors. The
VIO violet chip operates at a higher efficiency wavelength than blue
LEDs. Phosphors applied to the hemispherical lens of the VIO LED
convert its violet wavelength to white light. VIO LEDs are offered in
3500K and 4100K color temperatures that can be used in many standard
fixtures designed for general illumination applications. „The availability
of Lumination‘s VIO high–power white LED is a significant milestone on
the path toward general illumination with GE–quality LEDs,“ comments
Kraig Kasler, vice president of marketing, Lumination, LLC. „Our
investment in this major new product underscores the commitment we
made earlier this year to pursue global distinction in the general
illumination market. We think our violet–chip technology offers the best
available control of color shift in white LEDs.“
Oftentimes, LEDs used in fixtures produce glare or bright spots. The use
of multiple point sources in fixtures (e.g., several LEDs grouped together)
has the potential to produce multiple shadows. VIO LEDs eliminate such
distractions. High–power, 4–watt VIO LEDs distribute diffused light
more evenly over a 180–degree beam angle.
The color of Lumination‘s VIO high–power white LED is so stable that its
light can be used with confidence as a replacement for traditional
general illumination light sources.
„With this new product, we‘re ushering in a new era for lighting fixture
OEMs and designers,“ notes Kasler. „Incorporating LEDs in a lighting
scheme is more than a novel approach or smart move from an energy
standpoint. Based on its performance, our VIO LED is a real alternative
light source that will maintain a consistent appearance over a period of
years.“ Potential applications for VIO LEDs include general (pendant,
sconce), commercial (task, display), landscape (pathway, in–ground)
and architectural (wall wash, marker.) lighting.
Copyright © 2007 Luger Research & LED professional. All rights reserved.
Seoul Semiconductor
Unveils Warm White Acriche
of 42 lm/W
Seoul Semiconductor announced that Acriche, the world’s first
semiconductor lighting source for AC power outlets, can now achieve
warm white of near-daylight quality, making it suitable for general and
indoor lighting applications. The warm white Acriche features 42 lm/W
based on light source.
Actual System Efficiency – which takes into account luminous efficacy,
ballast efficiency and luminaire efficiency – for the warm white Acriche
is 39.9 lm/W. This is higher than 7.5 lm/W for incandescent lamps and
30.6 lm/W for compact fluorescents.
Warm white Acriche is a suitable replacement for DC-LED lighting.
Compared to conventional warm white DC LED which has a luminous
efficacy of nearly 35 lm/W, the warm white Acriche at 42lm/W is 20%
more efficient. Warm white Acriche can also produce a brighter lighting
environment without the need of a converter or ballast.
Seoul Semiconductor has also released warm white Acriche with a
luminous efficacy of 33 lm/W which has a Color Rendering Index (CRI)
rating of 90. The CRI measures the ability of a light source to produce
vibrant colors in objects. A CRI rating of 100 suggests that the light
source is equivalent to daylight, while a low CRI rating near 0 suggests
that colors will appear unnatural under that particular light source.
Acriche Warm White’s high CRI ratings and superior color rendering
capabilities make it an ideal solution for environments that demand
vibrant and accurate lighting, such as museums, luxury hotels, art
galleries, show rooms and displays.
For many years, the ability to produce a warm white semiconductor
lighting source that can also offer a high quality CRI rating had appeared
illusive. Today, that hurdle has been successfully negotiated.
“The need for alternative lighting sources has never been more pressing,”
said Seoul Semiconductor CEO Cheong Hoon Lee. “Environmental
www.led-professional.com LED professional Review | June 2007 | page 7