OP, for around 10% (maybe 20%) for your proposed cost you can have an electric light installed that is fully controllable and WORKS when there is no sunlight. I am sorry I really do not understand solar tubes, and actually find them annoying at times, I guess this is why they now have dimmable units.
This is my personal opinion I hope you find what you are looking for.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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