He asked what the difference are between PS-2 and PS-3. I did not assume the discussion was specific to PS-3 upgrade kits which don't exist yet. Who knows what the upgrade will do, there is talk about including LEDs again.
As far as the PS-3 boards though, they support LEDs. If another board is attached to the PS-3 board to support bulbs, that is a different discussion in my opinion. G