The beam angle show the light of led bulb lights is concentrated or open. It is one of the most important parameters when you choose an LED bulb, but most people usually ignore it.
Different beam angle lead to different application of the led bulbs.
If you use a camera, then you can understand the beam angle easily. It likes the camera zoom, the narrow beam angle bulb will concentrate all the lighting in the center, a small area, in order to focus on light up a painting or other special items is great. Led lights with big beam angle, such as 120 degrees, gives more uniform lighting to illuminate the room, so it is a better choice for the home lighting. It is much more pleasant and natural.