This is a very useful piece of kit. I have to admit to being a little sceptical of it at first when Jonathan Harrison first showed me one, but I have been becoming more and more of a fan.
It is infinately dimmable so you can get exactly the right level of light from it; it is very light in weight so easily moveable and transportable and gives off very little heat so it is handy in tight situations. The other useful feature is the hot-swappable tubes which come in daylight and tungsten colours. These can be mixed and matched in the one unit to give to a more controlled colour temperature. You can't exactly light a rugby pitch at night with them but they are very good for interior location work.