Cut down to it's minumum 50 joules at a distance of seven feet the flash reading on 200 ISO was still f6.7, which was a lot more than I would have liked. At f6.7 the inside of the stable needed an exposure of about 1/3rd of a second, and the sky needed 1/2 of a second to get some detail in the lighter areas. The discrepency between the two exposure requirements was only half a stop, so I went with the longer exposure because a little over exposure inside the stable would be fine.
With a 28-70 f2.8L series lens on a DCS520 I started shooting pictures of the upper half of his body and a little of the stable roof and sky. Without changing the exposure I changed lenses to the 17-35 f2.8 and moved back. As I moved back the sensor floodlight came on and the light shining into the lens gave some strange pink flare (bottom right) and the floodlight made an excellent element in the composition. By this time I was hand holding the camera at 1/2 second, which meant that there would be some camera shake so I shot about twenty frames at the same exposure in the hope that a few of them would be still enough to work.
I shot some safer images as well with the inside of the stable lit by another Lumedyne head complete with a warm up filter to simulate the tungsten glow. The image worked really well, and I am more than happy with it. It shows that light and location are the most important factors when planning a location portrait.