An optical system, comprising: a substrate; a light source mounted on the substrate and including multiple sets of light emitting arrays; a light pipe arranged corresponding to each set of the light emitting arrays, including an input surface, at least one light guiding surface and an output surface; and an optical lens, wherein light emitted from the light emitting array enters the light pipe via the input surface and is outputted from the output surface through light homogenizing treatment by the light guiding surface, such light out of the light pipe forming a light beam and being emitted via the optical lens, wherein the optical system further comprises a honeycomb-like cover including multiple through holes, each through hole sleeved on each lens of the optical lens, a cross section of the through hole matching with a maximum cross section of the lens of the optical lens, and an overall shape of the through holes arranged on the honeycomb-like cover matching with an overall shape of the light source arranged on the substrate, wherein the honeycomb-like cover includes an upper honeycomb-like cover and a lower honeycomb-like cover, characterized in that the axial height of the upper honeycomb-like cover is between 8 mm and 45 mm; and the lower honeycomb-like cover proximal to the light source has an axial height of h1 ≥ H - L/tanα, in which H means vertical distance between the lens of the optical lens and the output surface of the light pipe; L means half of a center distance between intermediate points of two light pipes; and α means half of a divergence angle of the output surface of the light pipe. a substrate; a light source mounted on the substrate and including multiple sets of light emitting arrays; a light pipe arranged corresponding to each set of the light emitting arrays, including an input surface, at least one light guiding surface and an output surface; and an optical lens, wherein light emitted from the light emitting array enters the light pipe via the input surface and is outputted from the output surface through light homogenizing treatment by the light guiding surface, such light out of the light pipe forming a light beam and being emitted via the optical lens, wherein the optical system further comprises a honeycomb-like cover including multiple through holes, each through hole sleeved on each lens of the optical lens, a cross section of the through hole matching with a maximum cross section of the lens of the optical lens, and an overall shape of the through holes arranged on the honeycomb-like cover matching with an overall shape of the light source arranged on the substrate, wherein the honeycomb-like cover includes an upper honeycomb-like cover and a lower honeycomb-like cover, characterized in that the axial height of the upper honeycomb-like cover is between 8 mm and 45 mm; and the lower honeycomb-like cover proximal to the light source has an axial height of h1 ≥ H - L/tanα, in which H means vertical distance between the lens of the optical lens and the output surface of the light pipe; L means half of a center distance between intermediate points of two light pipes; and α means half of a divergence angle of the output surface of the light pipe.