How to reduce maximum LED brightness
Put lower power bulbs in the offending fixtures. If you were sneaky about this, you could reduce the power in stages so that the insubordinate bunch you are afflicted with would not notice that the fixture was putting out less light than formerly.

If you wanted to be public about taking charge, you could put a filter on the cans that are too bright. A black wire screen would reduce light output but still allow air flow to keep the lamp at the desired temperature.