I'm new, please be kind.

I have simple scene. the only source of light is from a point light source
projecting through a slit in a wall that then falls on a prism.  I want the
resulting rainbow to illuminate the scene.

I have the scene set up and it works nicely, except the image produced is
too
dark. What can I do?

I cannot find any info on how to adjust the sensitivity of the camera.  I
cannot see how to get the same effect from spot lights or other light
sources as I need the slit shaped light source. Also, would spotlights
actually be brighter?

I would post the scene and image but I'm not allows to in this group -
should I ask in another group?

Regards,
steven

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