New MEMS White Paper

Download the latest Logitech white paper and learn more about MEMS processing technology and techniques

Download our CMP White Paper

FREE subscription
Subscribe for free to receive each issue of Semiconductor Today magazine and weekly news brief.












20 April 2007


Seoul Semiconductor unveils 42lm/W warm-white Acriche

Seoul Semiconductor Co Ltd (SSC), Korea’s leading LED producer, says that its Acriche AC-LED can now achieve warm white light of near-daylight quality with a luminous efficacy of 42lm/W (20% more efficient than a conventional warm-white DC-powered LED with an efficacy of about 35lm/W). This makes Acriche (which SSC claims is the first semiconducting lighting source that can be driven directly from AC power outlets, without the need for a converter or ballast) suitable for general and indoor lighting applications.

Actual system efficiency (which takes into account luminous efficacy, ballast efficiency and luminaire efficiency) is 39.9lm/W, which is higher than the 7.5lm/W for incandescent lamps and 30.6lm/W for compact fluorescents.

SSC has also released a warm-white Acriche LED with an efficacy of 33lm/W that 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 of 100 suggests that the light source is equivalent to daylight; a low CRI rating near 0 suggests that colors will appear unnatural under that particular light source.

The ability to produce a warm-white semiconductor lighting source that can also offer a high-quality CRI rating has been elusive for many years, says SSC. The warm-white Acriche’s high CRI ratings suit environments that demand vibrant and accurate lighting, such as museums, luxury hotels, art galleries, show rooms and displays, the firm adds.