'World's brightest' LED claimed by Seoul
<h1 class="articleHeadline" minmax_bound="true">From Optics.org</h1><h1 class="articleHeadline" minmax_bound="true">'World's brightest' LED claimed by Seoul</h1><p class="standfirst" minmax_bound="true">A 240lm single die light source, developed by Seoul Semiconductor, is claiming the crown of "brightest ever" LED.</p><div class="articleBody" minmax_bound="true"><div class="articleThumbnailRight" minmax_bound="true"><a title="Bright light" href="http://optics.org/optics/Articles/ViewObject.do?channel=technologyarticleId=26565page=1objectName=p4side" minmax_bound="true"><img title="Bright light" alt="Bright light" src="http://images.iop.org/objects/optics/news/thumb/12/12/8/p4side.jpg" minmax_bound="true"/><br minmax_bound="true"/>Bright light</a></div><p minmax_bound="true">Seoul Semiconductor has released a single-die white source that can emit up to 240lm at its maximum drive current of 1A. The new "P4" emitter is also claimed to offer the world's highest luminous efficacy, coming at 100lm/W at the 350mA at the 350mA drive current that is required for general illumination applications.</p><p minmax_bound="true">For comparison, a conventional fluorescent lamp offers an efficacy of 70lm/W, while an incandescent bulb delivers 15lm/W. Seoul says that two types of commercial device are available – one operates at a typical efficacy of 100lm/W at 350mA, and the other is rated at 80lm/W.</p><p minmax_bound="true">"The P4 is making history in the lighting industry as the alternative to conventional fluorescent and incandescent lighting sources," said Jung Hoon Lee, CEO of Seoul Semiconductor. "Conventional LEDs have been known to emit more than 100 lumens with several dies. Seoul Semiconductor's P4 is the only LED product in the world with 240 lm via a single die." </p><div class="articleThumbnailRight" minmax_bound="true"><a title="Seoul power" href="http://optics.org/optics/Articles/ViewObject.do?channel=technologyarticleId=26565page=1objectName=p4top" minmax_bound="true"><img title="Seoul power" alt="Seoul power" src="http://images.iop.org/objects/optics/news/thumb/12/12/8/p4top.jpg" minmax_bound="true"/><br minmax_bound="true"/>Seoul power</a></div><p minmax_bound="true">Seoul says that the high luminosity was reached through its proprietary phosphor and packaging techniques, and further improvements are in the pipeline. A 135lm/W source is due to emerge next year, and more incremental improvements are expected to lead to 145lm/W performance early in 2008.</p><p minmax_bound="true">In October this year, Cree revealed its brightest commercial product - a 160lm white LED XLamp, which is said to operate with 85lm/W efficacy at 350mA drive current.</p><p minmax_bound="true">Meanwhile, researchers at Nichia’s laboratories recently published a paper in the <i minmax_bound="true">Japanese Journal of Applied Physics</i> detailing a high-power white LED capable of producing 402lumens at 2A, and a luminous efficacy of just over 90lm/W at 350mA.</p></div><h3 minmax_bound="true">About the author</h3><p minmax_bound="true">Matthew Peach is a contributing editor to optics.org and OpticsLaser Europe</p>
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