LED with a lens, the concentrating effect will be better, the light within the lens irradiation range is relatively uniform, and the scattering is strong without a lens. For example, if there is no lens, maybe the whole room is bright, but the brightness is not good, reading what can not see anything, the lamp is very bright, and the lens and the condenser bowl are added, the irradiation area is reduced to the size of a table, but this area is very bright and can be seen clearly.