Aside from positioning and coloring of your light, one of the things to tweak till it gives you wanted effect would be fallof. 
If I'm visualizing this right, candle light doesn't cast a lot of light, so your falloff distance should be rather short, and pretty rapidly declining at first.

This is conceptually and off the top of my head, I don't know the exact names of setting and dials. I'll have to get that little later, when I have tiome to fire up poser.

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