Here is my version (copied as faithfully as possible) of your green spotlight.

I am using white props. The backdrop is matte (no specular) and the pawn has specular and reflection, too.

This is exactly what I'd expect from the green spotlight alone, and I am willing to bet a lot of money that P6 would have produced this exact same image. I am not using GC or IDL here.

Notice how dark it is? Your images are much brighter (in the diffuse reflections - don't get confused about my not using your specular-only light - that would only change the speculars.)

Because this is so dark, I strongly believe you had other diffuse lighting, such as IBL.

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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)