Definitions for "Beam Angle"
Indicates the spread of the beam of light. The smaller the number, the tighter and more intense the beam. A typical 50 watt PAR30 bulb has a beam spread of 8 to 60 degrees.
The angle of the cone of light produced by a lantern. Defined as the angle within which the lowest intensity in a beam of light from a lantern is not less than one-tenth of the maximum.
The angle between the central axis of the radiation beam and the plane of the film.