| abstract |
Provided is a lighting device capable of suppressing the action on a living body while improving the visibility in a low vision environment. The illumination unit has a peak wavelength at 420 to 460 nm in a blue-violet to blue wavelength region and a wavelength of 510 to 530 nm in a green wavelength region, and includes at least the two in a range of 460 to 510 nm. It is configured to be lower than the emission intensity in the wavelength range. Thereby, as for the illumination part, S / P ratio which is a ratio of dark place visual luminance and photopic visual luminance is 2.1 or more, and the bioactivity representing the melatonin secretion inhibiting action per unit brightness is 0.7 or less, It is configured to be able to irradiate white light having a color deviation Duv within ± 20. [Selection] Figure 3 |