You might want to download the instruction manual before you make a purchase. Look carefully around you attic and make sure there aren't any obstructions where you want to install the tube. Ideally you want as short a straight line distance as possible between the ceiling a roof (for light transmission efficiency and extension tubes get expensive). Any time you penetrate the roof you need to be careful. Just make sure you read the instructions carefully and follow them. Be careful when you pry up the shingles and do it on a warmish day (shingles break if bent in the cold). If you're not comfortable working on a roof or don't know much about roofing, you might want to pay a professional.

They do add considerable light to a room and my clients usually spent the first week reaching for the light switch when they left the room. :-)

Mike's comment about people reaching for the lite switch is funny. My visting brother in law was doing the same thing. Kept trying to shut off the lite.

Also, I noticed on the solarskylite site they sell a dimmer option. don't know how much, but it's an option.

I'm installing a lite kit as well so I can use the same space where the existing lite is and still have lite when the sun is down.

I saw, if you have 2 stories, an installation where
lighting was created on the first story by slots of holes
with glass flooring installed next to the wall in the floor
separating the 2 stories.

Lighting from the top story which was piped in very close
to these in floor glass capped slots along the wall gave
a wash of light to the first story wall.

It really worked.

It was from one of the BBC 'Grand Designs' series but
I can't tell you which of the 100 shows over 12 years sorry.

I'm a scientist and work a lot with lighting. It's seemed
to me that the design of the tube is stable and can't
be improved much.

However I firmly believe that the cap which is the important optical part of the system has the potential
to vastly improve or degrade the performace especially
on days where you might have overcast or during change
of season where the Sun is lower in the sky. Without
a consideration of these changes the cap on the tube
can't work right.

Ones I've seen, and I'm no experienced with them, had
only a frosted globe. Another had a directed capture
shape with angled pieces which was meant to point at
the source of light. If I bet on which one gathered more
light during periods of dim light I'd pick the one that
points at the source of light. today with our designs
and especially the economnic conditions you will see
people working harder for your Dollar and that means
innovative designs which work better.

No one can afford to be found to be faking a 'good design' so I would trust that if you find new products do a search
for reviews from reputable sources and then check youtube
and write up a request her for replies.

Do your homework and you'll enjoy your investment
more than if you simply buy it.