| 摘要 |
This invention relates to a method and apparatus for improving the color rendering of a lamp or light source. Specifically, a solid state light source such as an InGaN LED is driven by a modulated signal in which portions of the signal are provided with different forward currents within a single cycle. The different forward currents can provide a variation in the dominant wavelength emitted from the LED for each portion to provide a broader range of color produced by the LED. The pulses and cycle may be of sufficient frequency to provide an apparent constant light to the human eye without color change although the use of varying dominant wavelengths to provide the overall color can improve the LEDs color rendering. An improvement in such color rendering may be particularly important when the lamp or light source is used for illumination either on its own or in conjunction with other LEDs.
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