If your fixtures are in good shape, you could just replace the tubes with LED's. Just watch the color temp ratings, (deg K) on the replacements. If your existing lights are cool white, then 4100K LEDs will match. If you want to go warm white, then 3500K or lower are a good option.
Depending on the type of retrofit tubes you buy, you may need to re-wire the fixture by removing the ballast.
Fixture replacements are readily available if you want to go that route. Many options available including dimming and color changing via bluetooth and a smartphone app.
Bob
