'Steady lights make it easier to identify some problems before shooting.'

I've never even considered flash...

But what about tungsten film vs daylight film with a filter?

Tungsten films for still cameras were usually designed for long-ish exposures without reciprocity failure. Remember the old 'Type L' Vericolor? L for long, S for short. Ektachrome 64T (EPY) needs no correction up to 10 seconds, and only a little correction between 10 and 100 seconds. EPN, on the other hand, isn't recommended for exposures longer than 1 second, and even then Kodak recommend a CC05M filter for a 1 second exposure.

Portra 100T, which would have been worth considering if you had required prints, needs no correction up to 5 seconds - so that just goes to show that tungsten still films aren't always designed for long exposures in comparison to their daylight stablemates.

Best,
Helen