Couple years ago I bought a sack of those LED panels with all the adapters.
They work great, even I had to replace dual-side tape on them with US-made one.
My camper has original fluorescent fixtures on the ceiling, so I cut off original interior from them and put 8 of those panels over the table and 6 over the cooktop.
Than put original cover back.
They might not last for years, but for $1 a piece, I can afford that.
For small light fixtures direct bulb replacement might work better, but this is great starting kit.