They make a big difference. Well worth the extra hole in the roof and I don't like to put any extra holes in a roof..
I picked up a 14" one at depot on clearance last year. It's for the kitchen and I'm about half way through the kitchen remodel now. Have led cans over the counters and over the fridge and tall cab next to it. I have led tape light under and over the cabs and it alone is enough light for most kitchen usage.
The plan is that the skylight will provide most of the light during the day. It's a big kitchen and the window is a 36"x36" facing north with a large overhang and porch roof just to the east.
I have used them before and the one thing I recommend is to insulate the tube. Mine being 14" use 16" flex duct to insulate it.
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