I am trying to design a system that utilizes 355nm and 370nm LEDs. I want to keep their intensity stabilized at a certain value, so I want to create a feedback loop. I am using these LEDs as individual transmitters, and want to use an additional receiver adjacent to each transmitter LED to sample the intensity of the LED for the feedback loop. My question is, are there any LED packages out there with a built in transmitter/feedback receiver pair?
If this sounds confusing, below is a diagram the package I need
((LED)(Feedback Reciever)Package) -------------transmission medium------------ (Reciever)