Never thought of that before. IMO
I would contact the maker of the fixture or even someone like Coralife and ask them.
I know people run 55 watt bulbs in a 65 watt fixture, but yours in quite a difference.
I'll see if I can find anything on the net.
The only thing I could find was there are maximum watts on the CF
ballast's and no minimums. People have them configured in all sorts of ways.