Patent ID: 8358089

Claim:
A multichip LED lighting device comprising at least two types of LED chips, which include a first type of white phosphor-coated LED chips and a second type of LED chips, wherein said first type of white phosphor-coated LED chips emits a light at a correlated color temperature of 6500K within the tolerance quadrangle defined by (0.1961, 0.4793), (0.1905, 0.4676), (0.2005, 0.4576), and (0.2055, 0.4682) on CIE 1976 UCS chromaticity diagram and said second type of LED chips emits a light emission having a saturated color with a single peak wavelength from 583 to 586 nm in its spectrum, wherein when said first and second type of LED chips are powered with a lumen proportion of X:Y, where X=0.28˜0.93, and Y=1−X, emissions from said first and second type of LED chips overlap and form an effective white light having a correlated color temperature from 2700 to 5700 K along the Planckian locus on CIE 1976 UCS chromaticity diagram with Duv tolerances of ±0.006.