Patent ID: 9605815
Date: 2017-03-28
CPC Classifications: F21K,F21V,F21Y,H01L

Claim:
1. A white light source that is used for task illumination, comprising: a light emitting diode having a light emission peak wavelength of 350 to 490 nm; and a phosphor that emits visible light upon excitation by a light emitted from the light emitting diode; wherein, with respect to all local maximum values of light-emission intensity between 350 and 780 nm of a light emission spectrum of the white light source, a ratio of a local minimum value of light-emission intensity that is closest on a long wavelength side to the local maximum value is such that, when the local maximum value is taken as 1, the local minimum value is 0.7 or more, wherein a local maximum value accompanying with a local minimum value at a shorter wavelength side does not exist at a wavelength range of 600 nm to 700 nm, and wherein a maximum peak intensity of the light emission spectrum of the white light source is within a range of 491 to 780 nm.