| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an LED light-emitting device which, while securing appropriate brightness as illumination light, can maintain circadian rhythm normally and can secure the consistency of biological rhythm relative to an ambient environment. <P>SOLUTION: The light-emitting device synthesizes white rays of light emitted by a first and a second LED to emit. The first LED includes a first semiconductor light-emitting element which emits light having a peak wavelength in a range of 430 nm to 490 nm and a first wavelength conversion member which emits white light derived by synthesizing a wavelength converted part of light emitted by the first semiconductor light-emitting element and light transmitted as generated by the first semiconductor light-emitting element, and the second LED includes a second semiconductor light-emitting element which emits light having a peak wavelength in a range of 360 nm to 420 nm and a second wavelength conversion member which emits white light derived by converting the wavelength of light emitted by the second semiconductor light-emitting element. The white light of the first LED, as compared with that of the second LED, is such that the energy intensity per total luminous flux of its spectral component in a wavelength region of 445 nm to 480 nm is greater than the other. <P>COPYRIGHT: (C)2012,JPO&INPIT |
