How to quickly test the luminous angle? In a laboratory environment, an angle distribution tester can be used. In a normal environment, a simple method is to use the fluorescence reaction characteristics of white paper to ultraviolet light, align the paper surface vertically with the light emitting surface of the lamp bead and center it. The angle at which the blue and white areas are visible to the naked eye is the light emission angle. As shown in the diagram below, it is easy to see that the emission angle of the Deep Purple Technology hemispherical lens beads is around 60 °
