This may not sound impressive, but it’s a step towards having LEDs used for blinkers on cars, yellow on stop lights, and other consumer products such as lower-cost LCD devices. 

“A nitride phosphor with peak emission at 590 nm in the form of a dense ceramic – Lumiramic is attached to a highly efficient blue emitting InGaN diode, so that full conversion of blue light is achieved. A total External Quantum Efficiency (amber photons per electron) of 32% has been reached, resulting in a 300% improvement over the best direct AlGaInP LED”

http://www.physorg.com/news167555795.html