光束角 meaning in English
beam angle
Examples
- Method of measurement of center beam intensity and beam angle of reflector lamps
反射灯中心光强和光束角的测量方法 - The ratio of the flux emitted within the solid angle defined by the beam spread , to the bare lamp flux
由光束角限定的立体角内辐射出的光通量与裸光源光通量之比。