| abstract |
A lighting device according to an embodiment includes a controller including an RTC; LED driver; and an LED lighting fixture, the LED lighting fixture comprising: a first light emitting unit emitting light for illumination including a first light emitting diode and a wavelength converter emitting light having a peak wavelength within a range of about 300 to 470 nm; and a second light emitting unit having a peak wavelength in the range of about 286 nm to about 304 nm and emitting light suitable for vitamin D production, a third light emitting unit emitting light having a peak wavelength in the range of about 605 nm to about 935 nm and suitable for producing a cell active material a light emitting unit, and at least one light emitting unit of a fourth light emitting unit emitting light having a peak wavelength within the range of about 400 nm to about 430 nm and suitable for sterilizing pathogenic microorganisms, wherein the controller controls the LED driver to The irradiance of light emitted from the second light emitting unit, the third light emitting unit, or the fourth light emitting unit included in the LED lighting fixture is changed with time. |