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First, while not technically correct, "strobe" and "flash" are used interchangably in the photo community. Every light we sell is flash (a.k.a. "strobe").
The beauty dish is not a source of light, rather it is a light modifier that attaches to a light.
In a small studio environment, one light triggered by the camera (i.e. sync cord) will then trigger the remaining lights via the optical slave eye. Radio remotes, such as the CyberSync system is very nice to have. Again, only one transmitter for the camera and one reciever for one light is required. Additional receivers are only required if the optical system is unreliable, which is rare in a studio. If you decide to go with the Cyber Commander (which included a light meter, and the only light meter we sell), you will want a reciever for each light to maximize the benefit of the system. AC vs. battery recievers will more of a personal choice. Battery recievers will allow use with a broader range of lights (including speedlites), while AC powered recievers free you from more batteries.
The typical set up for a white back ground is 2 lights for the back ground. B400 units can do that fine, or you may wish to go with B800's to allow for higher settings on your main and fill B400's.
You imply you want to get rid of the shadow on the side opposite the 400 you have now by usign another light. Tyoically, you want to keep the shadow to give demension to the image, but you want to still see detail in that shadow area. Another light will do that, and it is typically used with a large modifier so that it does not create its own shadows. Large softbox, umbrella, or PLM will do nicely. As this is getting outside of technical and more into technique, our sales team will be more than happy to select a specific product for this aplication.
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