What Larry said. I am putting up 16 4ft long LED lights in my shop now. We're installing the ceiling this week but once that is up I will be installing duplex outlets in the ceiling and plugging the LEDs into the outlet. My shop is a pole building (see my avatar). It had 4 8ft florescent shop lights in it when I bought so it also had the wiring in place. I just pulled the florescent off the ceiling and gave them away.
As for light quality, we've been working in the building doing insulation and walls so we needed light so we temporarily installed 3 of the LED and we had great light, better than the original florescents. I can only imagine the light I'm going to have in there once I fire up all 16. I like bright lighting when I am working.
BTW, I got mine at COSTCO on sale for $20 apiece but you can fine them any place now for about the same price.