Thanks guys all very interesting stuff and a little more complex than I originally expected with the "power factor" etc.
I just wish I could trial some different models to compare. Might have to fly to US to do so though!
I think the netting idea could be a good option for various shoots and is lightweight and cheap.
The thing is, I can almost get enough grunt out of my kino diva 400 on an overcast day to match the exterior background to the interior I/V I'm shooting and I would have thought and looking at the photometric comparisons the 200W Joker seems to have more grunt (am I reading them wrong?).
The kino is obviously the key and is usually about1.5 to 2 metres away. The windows in a lot of the buildings we film in do have a tint to them (maybe 1 to 2 stops at a guess).
Also in regards to getting some nice fill when shooting exterior PTC's/ I/V's, ideally I'd probably use a reflector, but I live in one of the windiest cities in NZ and your lucky if you can get 1 person to try and hold it still let alone 2.
Are there any good, portable, light 1 person setup flecky systems? I'm thinking stands and grip heads etc. A solid poly would probably break and I couldn't fit it in my mid size suv.
Other options?
Cheers