I don't think that's the way you want to go. Even if you manage to figure out how to configure the probe light node (good luck) it won't give you realistic results. Plus, what about any other objects such as the floor or a figure. Plus, where are you shadows? Nowhere.

Much better is to use a setup like this. I put a spot light in position with each light panel. The panels and wall do not cast shadows. Each light has a cone from 50 to 160 degrees.

I used raytraced shadows on them, with 5 pixel blur.

Note I hid the wall here so you could see the spotlights.

Render coming next.

---

Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)