This is the bathroom, and that is the sky-light. It is small and bright. I have no lights on in this photo.
This is with the lights turned on. They have an option where you can have the sky-light installed behind an existing recessed light, so that's what I did. I had a light here, so during the day I use natural light, but at night, it still functions as a ceiling light, in the same spot.
The solatube is a small tube, with a reflective cap on the top. They drill a small hole in your roof, and run it directly into the desired spot in your ceiling. I can't even see the dome on my roof.
This is a bathroom of a Solatube customer, who installed theirs right over the bath-tub. I guess they decided to do this so they could keep the shades by the tub closed for privacy, but still attain day-light.
Bathrooms aren't the only place you can use them. This is a dark hallway.
This is the hallway with two Solatubes installed. I know, it sounds like I work for them! I promise, I don't! This is totally unsolicited- I just think it's a great solution to dark spaces, without adding artificial light. If you want to see how it works, visit their website here.