Abstract
Color rendering property (Ra) is one of the important indexes to evaluate the performance of illuminant. Controlling the light intensities for the four kinds of color LEDs (red, green, blue and white) on the portable-sized full-color LED panel, and then adding blue LED with different wavelength, the authors gained the high rendering property of Ra=96. At that time the Ra of the white LED was 87. This result concludes that it is possible to obtain superior color rendering property (Ra) even if the Ra of the white illumination alone is not high.
