In my 12 x 24 1.5 car garage with a 10' ceiling (walls and ceiling white painted sheetrock), I have Barrina's run end to end down each side of the cars. Works really well. I left the old school fluorescents in place since they still work. Tons of light for my aging eyes.
In reply to buzzboy :
If you've got fluorescent fixtures already, you can get tube conversions that pop into the existing fixture. You usually have to disconnect the ballast. That's what I did with my 8' lights as well as some 2' units in my kitchen - the way the latter were mounted, there wasn't enough room for the plug on the end of the Barrina.