This is fantastic and looks like Bron-built accessory...very professional! As long as you're using the modeling lamp for relatively brief periods, heat shouldn't be too much of an issue, likewise with your flash rate, but then that's even less likely to be a problem since the kinds of shooting conducive to fibre optic lighting tends to be pretty slow paced anyway.
By chance I happened to have my Bron fibrolite set out this past week for a little lighting test, basically just to have a play and see how it worked with some other recent additions to my studio setup, as well as see what the light levels from it were like paired with my Senso A2 pack (too bright, as it turned out, but thankfully the fibrolite has per outlet attenuation).
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This was the test subject. The LHS was lit using a snooted Picolite with the smallest grid + smallest aperture disc diffused through white acrylic, the RHS is with a fibrolite lightguide again through white acrylic, the ring at the rear is a microscope-derived fibre optic ring light with Volpi connector (which is what the fibrolite uses), and front (originally intended to illuminate the branding) is a very unrefined, second lightguide that I gave up on finessing as by that point it was getting late and I was tired!
I need to track down some better, more specific pieces of acrylic, and also work out the source of the difference in colour temperatures between the two opposing gradients on the pliers' head. And I need to find some more small-sized articulated arms for positioning purposes...the light guides themselves are small, but the hardware to position and support them quickly eats up space on the shooting surface once you're trying to place multiple sources on each side.
