I tried replacing my four 8' fluorescent lights with the conversion of the fixtures to direct wire LEDs  (they eliminate the transformer and connect directly to 120v) and while it provided better light I found that they put out a lot of RF (radio frequency) energy that interfered with my shop radio so I took them out. I also have three 2'X6' sky lights and two large windows and in good weather a 10'x12' roll up door that provide good lighting in the day. The ceiling tapers from 13' to 9'. 
I did the same in my garage with 4' fixtures and there is some RF but not as bad. I could still use a radio in there....if I wanted.  I converted the  fluorescent lights in two bathrooms the same way.  

There are some very nice looking flat LED panels that would work in some shops with limited ceiling height. They are only about 1" thick. I put an 18" square one in the kitchen of my rental house and it looks and performs much better than the fluorescent fixture which seemed to need frequent tube replacement. I heard that frequent switching on and off of  fluorescent lights is what burns them out so LEDs solve that problem.