110 lm/W warm white LED for 1 W and 3 W operation

Taiwanese manufacturer Epistar has developed a technology to reach high CRI and high efficacy for warm white LED to replace the low efficacy incandescent light bulbs. The 1 W package has a CRI of 90 and efficacy up to 110 lm/W for lower voltage (15 V) operation while the 3 W package has the CRI of 90 and efficacy up to 105 lm/W for higher voltage (50 V) operation. Both packages have a CCT of around 3000 K. The 1 W lamp combines several of Epistar’s blue and red LED chips in the same package, coated with yellow/green phosphor.

The power consumption and total lumens yield can be adjusted by modifying the combinations of the LED chips. The 3 W lamp used one high-voltage monolithically integrated DC multiple-chip array combined with several Epistar’s red LED chips. Yellow-green phosphors were used in both 1 W and 3 W packages. A bridge structure can be used with the 3 W lamp to achieve driving by an AC source. These packages can be used in E12/E14 candle light, E26/E27/GU10 light bulbs, PAR light and other applications for high efficacy warm white.