| 摘要 |
PROBLEM TO BE SOLVED: To maintain a hue of an output light flux at a target hue through feedback control.SOLUTION: Light-emitting elements of which emission wavelengths belong to a plurality of kinds of different wavelength bands are included and first, second and third light quantity measurement means are included. A rate of change of a sensitivity in spectral sensitivity characteristics relative to a changes of a sensitivity value and a wavelength in each reference wavelength is matched with a rate of change of a sensitivity with respect to changes of a sensitivity value and a wavelength in the same reference wavelength for three color-matching functions of an XYZ colorimetric system. A control circuit generates a hue instruction value correlated to a color of a light and performs feedback control on a drive circuit so as to reduce a difference of a target value. Therefore, while estimating a plurality of appearance modes relating to an appearance mode of a difference between the hue instruction value and a target value, information relating to a determination mode for a variation of an emission intensity instruction value is held and a mode similar to the generated mode of the difference between the hue instruction value and the target value is selected from among the plurality of estimated difference appearance modes.SELECTED DRAWING: Figure 1 |
