Color mixing enables high CRI and high LED efficacy

Marc Dyble, product marketing manager of SSL products at OSRAM Opto Semiconductors, discussed the potential of mixing monochromatic LEDs with phosphor-converted LEDs (PC-LEDs) to achieve high CRI and high efficacy at the same time. He presented this approach at the LED Show in Las Vegas last week.

Dyble stated that color mixing, marketed as Brilliant Mix by OSRAM Opto Semiconductors, provides an alternative method of achieving high CRI for applications such as high-end retail. He explained that typical approach today to attaining warm/neutral white light with LEDs and high CRI (>90) comes with a penalty of luminaire efficacy in the 75 lm/W range. Instead, if a combination of monochromatic LEDs (amber) are placed alongside phosphor-converted blue LEDs either in a multichip chip-on-board or multichip array, luminaire efficacy in the 90 lm/W range (up to 110 lm/W at the LED level) can be attained at 2700K.

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