The external luminous efficiency of the original Epistar WPE is about 30% to 35%, which although outperforms peers in the industry, still needs improvement to replace the traditional light sources. Thus, our R&D team adjusted the epitaxy structure to improve internal quantum efficiency and applied new technology platform to increase external luminous efficiency. In 2009/Q2, new 660nm LED product (BRPN42B) had been successfully developed. The WPE of BRPN42B can be up to 40~44%, which is a record high in the world.
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