Hi
The unit runs on 1-10V. As the DC voltage increases so does the AC output, so the unit has to be set to 1.5V as a base line to stop lamp flicker and then you can adjust from there
On the 54w ballasts we found the best curve was 0-50% after that you only gain 10% BUT you have heaps to play with in this 50%.
As for ballasts you can have 24w 39w 54w and 80w all in 110V
So if you want dimmable lighting in all wattages but do not have a Profilux..... Time to get one
The Profilux light II controller will also control these power bars and ballasts!!!!
Where to get the ballasts - Do a search for Philips advance mark 10 also Sylvania do them.
We have one dealer with them in stock for now if you email me i will give you the details.