Rim/back light compromise position

I'm trying to find a compromise position for my hair/rim/back light on an odd-ish upcoming project. Easier said than done. First, the context.

Client wants short video of a bunch of people reading parts of a book. They'll come in one at a time, sit in a chair, read a few lines, and go. I'm to record it all and edit it together to make a reading of the book. There's more to it than that, but that's the basic idea.

I'm going to set up a basic interview lighting scenario because I'm not going to have time to tweake it every time I get new talent in the chair. And even if I had time, lighting changes would be visible when I splice it all together. So I need a generic setup that I can lock down.

Which brings me to my question: How to setup the back light? Key and fill are sorta obvious, but back is eluding me. If I set up almost directly overhead I minimize scalp reflections from bald guys heads, but I get too much spill over the shoulders and down the front. If I rotate toward horizontal enough to make the ladies hair look good and get rid of most of the spill over the shoulders, the bald guys scalp shines like a beacon.

Where is the compromise position for this light? What I'm after is just a subtle touch of light on the shoulder for separation from the background, and just enough light on the hair to show some texture. But right now I'm chasing my tail -- can't find that sweet spot.

While I'm asking about backlight position... Which side should the back light be on? I'm thinking it should probably be on the same side as the key. I've tried it on both sides, and centered, all look different but none call out to me that one is better than the others. And there's no windows or practicals to motivate lighting. Or so I'm told. I won't see the set until next week right before the shoot (unavoidable, in another city).

So... Any ideas? Pointers? Suggestions?
 
Could you opt for a really subtle, soft backlight that's more above than behind? - that way you won't get harsh shadows up front or any nasty spill when you have the key/fill combo on too. I'd do that and/or bring in a background light as well. I'm sure there are other options out there though.

Adam
 
This depends a great deal on the "tone" you're after. Kid's book? Drama? Scary?

Key/fill/hair can be kind of tired and knee-jerk, unless the feel you're after is pretty dry and emotionless.

But - for backlight - I much prefer to get some outline of cheekbones and shoulder. It has a strong, dramatic look.

This was a still shoot, but I'd light a video similarly... just a key and a backlight; a splash across the back wall (which gave the barware a little sparkle), and a bit of ambient light from the location. If it were a motion shot, I might consider "wrapping" the key a bit more around the shadow side of the face. As-is, it was a strip softbox with fabric grid, backlight was an 11" reflector with a metal grid.

DSC_0900b.jpg
 
Try opposite side of the key to separate the talent from the BG. Since there will be a shadow there, the rim will edge light and separate the subject. If you use a kino or softbox flagged off, you should have a large enough source to cover taller or shorter people. Have a net or double net standing by and some powder fore the hairless gents.
The purpose of a rim light is to keep the shadow side from blending into the BG too much. If your BG is brighter on the shadow side, then you can even lose the rim as the lighter BG will separate the talent and silhouette them that is a nice look too.
 
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