I understand very well that 1-10V need to be cut off and I also aware that you told me this some time's.
I was just looking up why the light was still burning before it shut off. This answer I have now... so I know now it is not the reason from the computer I use or the Kind off Ballast.
I was just worried that I had the wrong ballast so when this was the reason I could buy another brand or kind.
So when DALI is also not a good option i will be stucked with what I have now and try to Light down slow as possible.

Thank you for your help