A light guide bar includes a light guide member and a light scattering member. The light guide member defines a cutout. The light guide member includes a first end surface, a second end surface, and a circumferential surface interconnected between the first end surface and the second end surface. The cutout is defined in the circumferential surface and passes through the first end surface and the second end surface. The light scattering member is received in the cutout and scatters light back to the light guide member. The light scattering member and the light guide member cooperatively form a complete cylinder, and a thickness of the light scattering member is less than a radius of the light guide member.