Followin' up on the 'Boo, you can easily rent lightbulbs.
The Kinos (mentioned earlier) are very cheap when rented. You can also rent a selection of colour-corrected tubes to use in them. Takes all of two minutes to swap out a 4-bank, and it doesn't break the bank.
Additionally, if you don't want to work with Kinos (and just fix the existing overhead tubes) you can rent day & night tubes to replace what's already there. (Or if you prefer, get a small step-ladder & a tonne ofgels to correct what you need to).
The thing is though, how much of the available light is going to be practicals?
There are a zillion films where light sources are never shown - your initial specification was lighting "from above". There are more films than you can shake a stick at, where light comes from above and the source is never shown. (usually because of rather obvious reasons)
Lemme dig up a video for you... brb