Really strange. I'm getting f/8 with 8ft of distance on a Streaklight 360 shooting with both layers of diffusion on the reflector, and then through a white silk shoot through umbrella :/ That's full power, ISO 100.
I'm I the only one to think this is a great light but the bulb design isn't so good? With the bulb off the modeling light is awesome very helpful to find shadows when setting up, with the bulb on it diminishes the effect of the modeling light and adds shadows making the modeling light almost useless. Also, with the XPLOR unit (Bowens mount) at least, the bulb just sits too far in and that results in less light. I have a 30x60 modifier from Paul C Buff that I put a bowens speedring on and at 3-4ft full power I can barely get f/9-f/10 out of it. I wish they made a circular bulb to work better with the modeling light or at least that we could find a spacer like the 360.



