Halo through Transparency map

I am working on some volumetric lighting in a project and I have a two part question:

Is there a way to get the halo to represent the color of the light if I use an image or movie as a texture for the spot lamp?

( I can get the spot to project an image so it looks like a movie projector on a plane, but the halo is white regardless of the color of the image being ‘projected’)

Next:

I am using a spot lamp with a halo to illuminate a n object (this one happens to be partially transparent through an alpha map texture) but the halo completely disregards the shadow effect of the plane it illuminates first.

I’ll try to post an image for both.

Thanks for looking.

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