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Eye strain with lights


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I'm doing some close quarters photographic and video work and both myself and my actors are experiencing eye strain with my CFL setups.

I have two, seven-bulb lights in softboxes. Each bulb is a 50W CFL. I also have a few 1000W halogens. At longer distances, all lights are fine. But with closer work, with the lights only five feet away from the actors, everyone is suffering eye strain, but only with the CFL bulbs. The eye strain remains even when the lights are operated at "low power." The halogen seems to cause much less of a problem for everyone's eyes, but start making us all sweat from the heat.

I would really appreciate thoughts on this. All of the stuff I've found online only addresses heat, throw, power, etc. Nothing talks about the effects on the actors except for concerns about UV radiation from some arc lamps.
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Thanks. After more research, I'm beginning to think that it may indeed be the flicker of the lights. Apparently, the amplitude of flourescent light flicker is very high. LED's usually operate on DC, thus no flicker, and incandescent bulbs have a very low amplitude to their flicker.

Ah well. I guess it's back to tungsten for close-up work. Better bust out my extension cords to distribute the load among my circuit breakers.
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