Model selection method for lens of deep sea laser lamp

The invention relates to the technical field of light-emitting deep-sea lighting devices, and particularly discloses a model selection method of lenses for a deep-sea laser lamp, which comprises the following steps: (1) providing a plurality of lenses to be tested and a test system; (2) two same or different lenses to be tested are installed at a first lens placing position and a second lens placing position of the test system, and the minimum light emitting angle of the light source in the air is measured by controlling the distance among the diaphragm, the first lens placing position and the second lens placing position; (3) calculating the minimum light emitting angle imin1 of the light source in seawater; if imin1 is smaller than or equal to 2 degrees, the to-be-measured lens can be used as a lens of the deep sea laser lamp; and if imin1 is greater than 2 degrees, the to-be-measured lens is not used as the lens of the deep sea laser lamp. According to the invention, the lens is selected based on the light