About the same time a Texas college did a similar study, with similar conclusions. Time is the forgotten factor. 12 hours a day vs 3 hours 3 days a week is almost 10:1
Commercial strips or 'low bay' fixtures are the answer to 'lots of light for low cost'. CCT choices and 80-90 CRI are normal. Gone are the greenish fluorescents and metal halides. A few hundred can get you 20,000 lumens of line voltage dimmable, decent color, large ugly fixtures that will flood all over the place.
A little more familiar would be the Altman worklight. 10,000 lumens, not dimmable, 90CRI and probably under $1000. So 2 Krieos in one.
re: I'd get the painters some big ol' scoop lights and your choice of 500w screw base lamps. Incandescent for the painters. Yes.
I don't disagree with the idea of using Scoops or other incandescnt sources (minus your maintenance time to replace bulbs) but I think the modern way of thinking about it is, how is your entire stage lit with the theatrical fixtures. If you are in an all incandscent rig, Scoops are great. A hybrid rig, still probably okay. A 100% LED/moving light rig, you may want work lights that match you source.
A related example from a different department that happened.
From the costume/makeup standpoint the makeup mirrors were all incandescent, but the director was unhappy when they came onto stage because it didn't look right. This was because the entire stage was LED and missing that last bit of incandescent red. The fix in this case was actually to change the makeup mirrors to LED bulbs that match the overall kelvin temp on stage...and it fixed that subtle difference.
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