| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting device capable of adjusting hues of light to a designated hue after guiding light to a duct, and an optical duct.SOLUTION: In a lighting device 1 used for an optical duct for guiding light from a first space to a second space, the lighting device 1 includes a light source for emitting first light having a first spectrum distribution, a measuring part for measuring a second spectrum distribution of second light after guiding light to the optical duct, and a control part for calculating chromaticity coordinates of third light including the first light and the second light by using a function for calculating chromaticity coordinates using the spectrum distribution as a variable, the first spectrum distribution, and the second spectrum distribution, and making the first spectrum distribution change in a direction to lessen a distance between the chromaticity coordinates of the third light and the reference chromaticity coordinates. |
