One Beam with a mesh light at the top and one without light.
On how to set up the volume for this to work, look here.
Here the two beam obj.
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To use use it, Import it as obj and scale it to your liking.
You can set the values of the mesh light at your liking.
I have followed Sigstan advice and the mesh light is only 1 polygon
For the best result i advise to read this (thank you Sigstan, for your tutorial).
It helps tremendous with rendering.
This i release as public domain, use it, alter it, do wat you like.