IMHO, my wife and I discussed installing solar tubes, and decided to have LED lights installed instead. The LEDS are much less expensive, are dimmable, very inexpensive to operate, and most importantly, available at night and during cloudy days.
OP, noticed this is your first post, so just a suggestion, search this site for the previous threads on solar lights, this will give you lots of background on these items. There is no economic reason to install these, they will never pay for them selves in your lifetime, so the reason to install boils down to natural light versus artificial light.
Please do not shoot the messenger, and I hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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