I’m sure there are many ways to detect LEDS at ICT. Many would use these color sensor inside the fixture. The only draw back for this type is the reliability and the costs of sensors themselves, also the fixture must be totally seal dark for the light sensors to work properly. I’ve never used any of these sensors for my LEDS tests. If we read the specs and the LEDS are well made, each color should have a consistent voltage drop across them at a certain design current. We can isolate the LED color by their voltage drops. Yes, Yellow, Red & Green voltage drops may be different by 300mV, we need to tune them accordingly. Make sure to use the histograms. Here are my tests.

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