Seoul Semiconductor Co., Ltd, the world-class LED manufacturer (www.seoulsemicon.com) announced that its Acrich MJT 5630D package, applicable to incandescent lamps, fluorescent lamps, and other lamps, have reached the world’s best luminous efficiency of 210 lm/W, which is the highest luminous efficiency set across the world for single LED package, and the package’s mass production has begun.