LED test methods

Test condition:
When using the follows methods of testing led, they include luminous flux、luminous efficiency、radiation fluxes、radiation efficiency、light intensity.
Luminous flux:
Test of luminous flux has two kind of methods: Integrating spheres and goniophotometer ; goniophotometer is a very precise measurement. but it takes a long time to test led. in general we using the Integrating spheres to finish test work . the Integrating spheres are has two kind test construction : one which is to put led resource into the sphere centre and the other is to put led resource into the spherical wall
Integrating spheres:
Different source of flux in the space out the distributions differ. now we measuring LEDs luminous flux with integrating spheres. a measure of luminous flux per unit area.The possible reasons for the self-absorption duration difference for different led resource were diversity . self-absorption correction by Auxiliary lamp is a well-optimized solutions .