The Absolute Luminous Flux Integrator (ALFI) is a special device for absolute measurement of the luminous flux output of lamps. It can also to measure the luminous intensity distribution of small lamps and luminaires.
The lamp is placed in a rotating lamp holder in the centre of the device. A photocell is mounted on an arm, which rotates about the lamp. The lamp's rotation presents different azimuth angles to the photocell, while the photocell sees different elevation angles of the lamp as it revolves around it. By rotating through all of the azimuth angles and measuring at the different elevation angles within each azimuth angle plane, the luminous flux is summed over the whole sphere around the lamp.
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||Can perform light distribution test of small items.