i visted a grow room over the weekend that uses 4 of these tubular skylights and one 600hps. the cool thing is that the tubes are flexible and you can put them on both pitches of the roof. the tubes are mirrored on the inside and man it was soooo bright! even overcast days capture enough light to brighten any room. needless to say the plants were HUGE. they even have mods that let you close the lens if you want it dark. this has loads of potential. this product is carried at most of big box hardware stores. pretty cool huh? herez the link.

http://www.sun-dome.com/

there are several different manufactures with their own name for this product but you get the idea.

Happy Trails