I've seen light proflies of LED candidates for OSEM: OP232 and TSTS7100, and found the latter is better in terms of the uniformity, which would be important parameter for OSEM.

Each LED is set in the LED holder of an OSEM, and I did the check above w/ and w/o the additional lens, which was said to help collimation of light; it looks helping situation somewhat.

When test benches are prepared, I can test them as OSEMs.