采用Ohno 等提出的发光二极管(LED)发光光谱数学模型，计算LED 芯片的发光光谱，并基于光谱叠加性原理，研究多芯片光源的混光特性。实验中用蓝光LED 激发涂覆其上的绿橙双色荧光粉获得暖白光，与红、青、蓝三种LED 光源混光。通过控制模块发送指令到脉宽调制(PWM)驱动电路分别调节各个LED 的驱动电流占空比，从而控制4种LED 的光通量及其配比，实现色温在2700 K~6500 K 范围内连续可调。在宽色温范围内，获得超高的显色指数，Ra 在95~98 之间，全部特殊显色指数(R1~R15)都在90 以上、辐射发光效率(LER)在286~336 lm/W 之间的白光LED 光源。实验测量与计算模拟结果的一致性很好。

The emission spectrum of light emitting diode (LED) are calculated by using the LED spectral model of Ohno, and then the spectral combination of multi-LEDs has been investigated theoretically and experimentally. In the experiment, the warm white light, which is obtained by blue LED die exciting green and orange phosphor, and red, cyan, blue LED light are mixed. By respectively controlling the duty ratio of the pulse width modulation (PWM) signals, the drive currents and luminous flux of each LED can be adjusted. A mixed white light source with ultra-high color rendering index has been realized for the first time, whose color temperature can be tunable within the range of 2700 K to 6500 K, Ra is between 95 to 98, all special CRIs (R1~R15) are more than 90, and luminous efficiency of radiation (LER) is between 286 lm/W to 336 lm/W .The consistency of experimental measurements and theoretical simulation are very well.