The opening of the integrating sphere (IS) is limited by the port ratio, roughly 4% of the sphere surface area. Therefore, there exist a tradeoff between enlarging the opening to collect more radiance flux from the LED, and maintaining the port ratio when the sphere is miniaturized. A lenses group can be designed to narrow the spot size of LED in order to minimum the volume of IS. By adopting the simulating method systematically, the spot can be narrowed from 1.5mm to 0.283mm. The corresponding volume of IS can be reduced to more 50% in size. It is possible to achieve the multichannel measurement on the wafer-level. The novel IS combined with the designed lenses group may be useful to raise the speed of the measurement of LED in the future.
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