Need to use the space for videos and photography
I can think of two reasons to keep some distance between studio lights and a ceiling:
Reflection, if the studio lights have so much spread that the light reflects against the ceiling, this can cause problems. Solution: use some frame to reflect the light, of change the direction of the lights more downward.
Fire hazards .. studio lights can get very hot and if the ceiling is from a material that heats up, you can imagine what might happen.
So probably you can leave less, but take the two above things into account.