Lighting device

Abstract

Provided is a lighting device, which can improve the visual recognition under the intermediate vision viewing environment and comprises a light-emitting part (11). The peak wavelength of the light-emitting part (11) exists within the range of 470 nm - 505 nm and the half-peak half-width thereof (B) relative to the peak wavelength thereof is 20 nm to 40 nm.

Description

technical field [0001] The invention relates to a lighting device. Background technique [0002] In various lighting devices such as fluorescent lamps and light-emitting diodes (LED elements), designs that increase the brightness of photopic vision in bright environments (photopic vision) are generally adopted. This is because in photopic vision, the cones that perceive brightness function, and by increasing the brightness of photopic vision, a person can perceive brighter. [0003] However, in the so-called mesopic vision (Japanese: thin photopic vision) of street space, road space, etc. at night, except for the above-mentioned cone whose spectral luminous efficiency (Japanese: spectral visual efficiency) has a peak value of 555 nm, spectral luminous vision Rods whose efficiency peaks at 507nm also function, so even if the brightness of photopic vision is improved, the effect is low. [0004] Therefore, for example, in the illuminating device of Patent Document 1, it is c...

AI Technical Summary

Problems solved by technology

[0003] However, in the so-called mesopic vision (Japanese: thin photopic vision) of street space, road space, etc. at night, except for the above-mentioned cone whose spectral luminous efficiency (Japanese: spectral visual efficiency) has a peak value of 555 nm, spectral luminous vision Rods with a peak efficiency of 507nm also function, so even if the brightness of photopic vision is increased, the effect is low

Images