Welcome :)
Well the tradition is to post a reflective sphere on a checkered plane as
1st post and you just missed the sphere :)
We'll say it is "far outside the room" ;)
Nice idea though if you want lights to really light your room after
reflections, you'll have to use photons and I guess it'll take long to build
a photon map for multiple relections.
An other way is to fake it by adding an arealight at the output of your tube
and/or use radiosity.
Marc

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