Patent ID: 8144316

Claim:
An instrument for measuring total luminous flux of luminous elements, in which an integrating sphere, a photodetector for measuring the intensity of illumination in the integrating sphere, and a baffle for preventing the photodetector from being exposed to direct radiation from a light source are provided, the instrument comprising: a lamp socket in which a plurality of installation portions for mounting a plurality of luminous elements are arranged such that the intensity of light emitted from the luminous elements is uniformly distributed in the inner space of the integrating sphere, wherein the lamp socket has a polyhedral or spherical shape such that the plurality of luminous elements installed in the installation portions are oriented in different directions from each other; a lamp socket mounting bar installed such that the lamp socket is located in the middle of the inside of the integrating sphere; and a constant current supply means connected in series to each of the installation portions and simultaneously supplying a constant current to the luminous elements.