I replaced several florescent lights with LEDs. With the ones I used you remove the ballast, and wire one of the tombstones directly to 120V, the other tombstone is just there to hold the tube. It is like a 10 minute operation to do the swap. They came with a sticker to apply near the hot end warning that they line voltage and to only use LEDs with built in circuitry. At our church we swapped out all the florescent lights with this type of tube, we're pretty happy with the results and the energy savings multiplied over several hundred florescent tubes was significant. Reduced maintenance was also a plus. There was certainly a labor factor in doing the swap, but a group of retired members did the swap over a couple of workdays.
One other thing in commercial buildings to save energy and reduce maintenance is swapping incandescent fire exit lights with LEDs. It may not seem like much but those little 15 watt bulbs burn 24x365, we probably had 30 of them in our church. I convinced the building manager that we should do it, rather than continuing to replace batteries on the traditional ones.