Hi @Neil Macmillan
I had a play with my FLX (ZerOS 8.0) and a Cameo Q-Spot 40 which has 16-bit dimmer. The fixture definition was written by myself.
I use the Z key to access the DMX Outputs tab to look at the DMX values sent to the fixture on addresses 1 and 2 where the fixture MSB and LSB intensity channels sit.
If I use the channel fader to manually play with the intensity, at 0% I see 0/0 (MSB/LSB). As I move the fader up the LSB goes to 128 and the MSB increments. When I get to 100% I see 255/255.
Instead, making the desk do the dimming, I set Programmer Time on at 10:00 (10 minutes) and type syntax 1@@. I now see the LSB incrementing from 0-255 and the MSB increment when LSB is 255. Similarly if I do clear-clear I see the LSB count down from 255 to 0 then the MSB decrement then the LSB 255 to 0 again. All the way down to 0/0.
So when the desk does the dimming, true 16-bit dimming is performed. When the fader is used, the dimming is understandably simplified - that fader doesn’t have 16-bit resolution!
Conclusion - 16-bit intensity dimming works as expected.
Hope that helps.