The beam angle of the downlight refers to the angle of the light beam emitted by the light source or the lamp, that is, the angle formed by the boundary of a certain intensity range of the beam.
Usually, the beam angle on the illuminated surface is more intuitively reflected by the spot and illuminance. Under the same other conditions, the larger the beam angle, the smaller the central light intensity, the larger the spot, and the smaller the illuminance, and vice versa.

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