[Uptown Girl]

There are a number of different brands (with different features and component parts). Each brand may offer a variety of different circumferences and a myriad of different kinds of ceiling lenses. Each lens gives different effects.

Where you place them in the ceiling, as in- a flat portion of ceiling or a slanted portion will affect the light as well, and so will the paint color of the walls.
The way the house is situated upon the lot will have an effect too, so seeing them in someone's home will give you a general idea, but not an exact one.

We have them. We looked at three different companies that install in TV and decided upon Solar Lights and More.
We went to their office/showroom- which is illuminated by their own solar light tubes. We liked seeing that for ourselves.

I would suggest using a real company and not an independent. We know of a couple that used an independent fellow- and although the light tubes were soundly installed, they provided very dim light.
When they saw ours, they realized something was wrong.

They had their fellow come back to remove them and got a refund- and they hired Solar Lights and More to co-ordinate replacement immediately afterward.
It turned out their independent installer forgot to remove (or was unfamiliar with) the protective, transparent blue plastic sheeting inside the tube.