An LED light bulb comprising a lamp housing, a bulb base, connected to the lamp housing, a spectral distribution of the light bulb is generally between a wavelength range of about 400 nm to 800 nm, and three peak wavelengths P1, P2, and P3 appear in wavelength ranges corresponding to light emitted by the light bulb, wherein a wavelength of the peak P1 is between 430 nm and 480 nm, a wavelength of the peak P2 is between 480 nm and 530 nm, a wavelength of the peak P3 is between 630 nm and 680 nm.