"Film lights" are pretty likely to be 5kW+ arc lamps. Lighting fixtures definitely include filters to keep the UV out of the beam, but film still loves giant HMI fresnels.
I should have been more specific, i had mean to say carbon arc, as those were alot different that todays technology, though I'm not sure about the level of UV protection offered back in the 70-80s
Carbon arc was definitely a whole different ball game. I'd think the fixtures were filtering at least most of it, or else everyone on set would have pretty much the same problems as someone doing arc welding without a mask and sleeves in short order.
