> I'm having trouble with getting anything to happen with the ceiling lamps.
>
> I commented out the central worklight and  I added a point light source to each
> of the fixtures - making 6 - and the scene was VERY dark, but took 16 times as
> long to render.   So it seems that POV-Ray recognizes the presence of the
> light_sources but no light illuminates my scene.
>
> Is there a known issue with including a light_source in an object definition and
> then invoking the object {} in the scene?
>

Looks like your shades may not let the light pass through, or maybe the 
lights are accidently located inside an opaque part of your fixtures.

You must make sure that the shades have a good bit of transparency. Be 
sure that max_trace_level is set high enough. In doubt, increase it by 5.

When using radiosity, backside illumination is also good. Just make sure 
that you increase recursion_limit by 1 in that case.

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