| 摘要 |
PROBLEM TO BE SOLVED: To provide a luminaire which, even when light is irradiated upon an irradiation object in the water, can make the tint of color of the underwater irradiation object to be a natural tint of color similar to the one on land.SOLUTION: A luminaire 1 comprises a main illumination white color LED 5, a color adjustment white LED 6 which emits light whose color temperature is lower than that of light emitted by the main illumination white color LED 5, and a control unit 9 which controls light from the two white LEDs 5 and 6. Light from the color adjustment white LED 6 has a chromaticity of chromaticity coordinates (x, y) in a direction in which, in a CIE chromaticity diagram, x increases relative to the chromaticity coordinates (x, y) of the main illumination white color LED 5 in the vicinity of a straight line passing through chromaticity coordinates (x, y) obtained from chromaticity coordinates (x, y) of light from the main illumination white color LED 5, the spectral distribution of light from the main illumination white color LED 5, and the spectral distribution of underwater transmittance corresponding to the underwater distance from the luminaire 1. |
