| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting method and a lighting device for preventing light pollution capable of arranging a visual environment giving a sense of security, having no complex mechanism and requiring less-expensive cost because of a superior prevention of light pollution, assuring of safety and smoothness in passing, walking and traffic, prevention of crime, assuring illumination intensity and high color rendering property required for improving safety and certainty over human activities and works and a capability of illuminating a lighting region under a uniform illumination intensity.SOLUTION: This invention relates to a lighting method for preventing light pollution by irradiating light irradiated from a lighting device against a light receiving face of a plant in such a way that integrated light emitting quantum flux density ratio of wavelength range of 550 to 700 nm to integrated light emitting quantum flux density of wavelength range of 390 to 500 nm may fulfill 0.80 to 1.43, and a lighting device for preventing light pollution in which a light source is controlled so as to fulfill the integrated light emitting quantum flux density ratio. |
