On the Boudoir Course yesterday, we demonstrated a simple but very effective shot using 2 lights and a set of blinds.
The very important thing to note is that the back light is 2/3 of a stop LESS than the main light - it is still very evident on the models hair in the final.
Here is a shot of the set-up:
And a diagram of the set-up showing the numbers:
And finally a result:
Simple yet striking- enjoy!