| abstract |
Provided is a white light source, comprising a blue light emitting LED with a peak light emitting wavelength of 421nm-490nm, and a fluorescent light body layer further comprising a fluorescent light body and a resin, With the emission spec-trum of the white light source designated P(λ), the emission spectrum of the black body radiation which denotes a color temperature which is the same as that of the white light source designated B(λ), the spectrum of the spectral luminous efficiency designated V(λ), the wavelength at which P(λ) x V(λ) is at a maximum designated λmax1, and the wavelength at which B(λ) x V(λ) is at a maximum designated λmax2, the relational formula -0.2≤[(P(λ) x V(λ))/(P(λmax1) x V(λmax1))-(B(λ) x V(λ)((B(λmax2) x V(λmax2))]≤+0.2 is satisfied, and the size of the color change between the initial lighting of a white light source which uses a CIE chromaticity diagram and after 6000 hours of consecutive lighting is less than 0.010. It is possible, with this configuration, to provide a white light source which has an equivalent emission spectrum to natural light, as well as a white light source system using the white light source. |