How to quickly test the luminous angle? In the laboratory environment, you can use the angular distribution tester. In the ordinary environment, you can use a simple method, which is to use the fluorescent response characteristics of white paper to ultraviolet light to align the light-emitting surface of the lamp bead with the center of the paper vertical. The angle of the blue-white area visible to the naked eye is the light-emitting angle. As shown in the following schematic diagram, it is easy to see that the light-emitting angle of Deep Purple Technology's hemispherical lens lamp bead is about 60°.
