Lopping angle

The angle is the angle under which a light beam spreads from its origin, to the level to which it meets. It indicates how focused or wide the light that is generated by the lamp.
The closer the low bent is, the more concentrated the light cone becomes, typical of focused light is a low lend angle of approx. 30 degrees. If it is a wide dimension angle, around 50 degrees, a wider field of light is generated.