(beam angle) refers to the angle between two directions in which the light intensity is equal to 50% of the maximum light intensity on a plane perpendicular to the center line of the beam.
CIE- International Commission on Illumination (Europe) 1/2Imax
IES- International Illuminating Society (USA) 1/10Imax
The beam angle reflects the spot size and light intensity on the illuminated wall. If the same light source is used in reflectors with different angles, the larger the beam angle, the smaller the central light intensity and the larger the spot. The same applies to indirect lighting. The smaller the beam angle, the smaller the ambient light intensity and the worse the scattering effect.
The size of the beam angle is affected by the relative position of the bulb and lampshade.
In addition, the angle contained in the direction of the luminous intensity equal to 1/2 of the peak light intensity is defined as the beam angle. Generally speaking, narrow beam: beam angle <20 degrees; medium beam: beam angle 20~40 degrees, wide beam: beam angle> 40 degree
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