A few people have asked this. I went ahead and compiled some results I found in various threads.
All these results are on a Copper star. C_K also has results at 3.8A, but I didn’t find a lumen measurement for that current.

Pulled from Match’s Emitter test thread.
Without going into too much depth 4A on a stock Aluminum star should be around 1000-1100lm (estimated OTF) in an X6.