I've been looking at interior LED replacements. Did the inside of my van a couple months ago, direct replacement, no modifications, and it's really bright. The motorhome has as many florescents as the old type. Not sure the energy savings difference between florescent and led.
I may look at solar somewhere down the road, but for now I don't to a lot of off the grid for extended time to make them cost effective, especially since the unit is parked next to my house where there is a plug in for it.