Is there a way to make an obgect act like a light without adding dozens of light object inside.?
I was able to make the object looks like a fluoresent neon light but no glow or causticg or photon emiting in mental Ray.
Try rendering with final gathering. For example: If the neon light texture is bright pink, try setting the ambient color and incandescence to the same bright pink color. Your object acts as a light. Try this link for examples: http://www.jozvex.com/tutorials/fg.html