The benefits of the white LED fluorescent is to avoid the energy loss of phosphor in the process of light conversion to a higher luminous efficiency; and can separately control different light color LED light, to achieve the color effec t of the full-color \\ and the wavelength and intensity of selection get a better color. The drawbacks of this method is that different light color LED core material is a big difference, quantum efficiency, light color is inconsistent with the drive current and temperature change with time decay with. In order to maintain the stability of the color, three color LED plus feedback circuit to compensate for the circuit is too complicated. In addition, heat is also troubled by the multi-chip white LED color temperature and color temperature. LED commonly used optical parameters and their measurement uniform commonly used optical parameters can be divided into the photometric parameters and chromatic parameters. Has degree of learning and radiometric parameters are the following. Draw the amount of the West. (Lumin. Us F1ux): light-emitting diode forward current for the specified value, the device optical window death of flux. Light in tensity I. (Lumin. Us of Intensity): light source luminous flux emitted within unit solid angle can be expressed as the spectral energy (the sX rate) distribution P (A) Fu a wavelength of the radiation energy distribution.
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