The beam width produced by floodlights may be larger or smaller, depending on the adjustment of the optical system and the position of the light source in the luminaire. By convention, the beam range of a floodlight is determined by a luminous intensity direction equal to 50% of the peak luminous intensity up the beam axis. The beam range of a circular symmetric floodlight remains the same on all faces, and the beam range of a rectangular floodlight is usually oval, which is determined by two values corresponding to two symmetry planes.

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