Hello, i'm looking at upgrading my product studio from rather old Speedotron packs and heads to something like Profoto. in the past in order to have control over each head (light) we have dedicated one pack to each light on set (average of three per set). if i upgrade to something like a Profoto D4 pack with all of it's controls will i still need to have 3 of these packs on set? At $9000 per pack, that gets pretty expensive quickly. Any thoughts would be most appreciated.