I have 16 ceiling light fixtures in my shop, evenly spaced, 40x 60 area, 12 foot ceiling--all were 8 foot florescent, either high output T12 or t8. I converted 6 of the t12 with direct wire LEDs, the highest lumen I could find and the whitest light, I believe 6000K. Way brighter than fluorescent and I noticed the light bill isn't as high. Recently I found three and four panel LED's at Menards that screw into a regular bulb socket. I have replaced four of the florescents with them, and like them, but not as well as the eight footers because with the concentrated source of light, they produce shadows that sometimes are a nuisance. For instance I have one over my lathe and if I lean over close to look at what I'm working on I create a shadow, where as the eight footers spread the light out. Something to think about when choosing lights.