How to quickly test the luminous angle? In the laboratory environment, an angle distribution tester can be used, Under normal circumstances, You can use a simple method, Utilizing the fluorescence response characteristics of white paper to ultraviolet radiation, Align the vertical light bead on the paper surface with the light emitting surface and center. The angle at which the blue and white areas are visible to the naked eye is the angle of light emission. The following schematic diagram, It is easy to see that the emission angle of the Deep Purple Technology hemispherical lens beads is 60°left and right.