A lighting device includes a plurality of first lighting units emitting a first light. Each of the first lighting units includes a light source, a light adjusting structure and a light converting structure. The first light is provided by the light source, adjusted by the light adjusting structure, and converted by the light converting structure. The first light has a sub peak between 400 nm and 500 nm and a main peak between 590 nm and 780 nm, and a normal intensity of the sub peak is greater than a tilt intensity of the sub peak.