You probably want a light with 18 to 24 5050 leds. What form factor depends on your light fixture, there is no such thing as one standard RV ceiling light fixture. There is also the matter of color. Incandescent lights emit a warm white light. some people like a whiter light or even a blueish color.
Suggest you buy 1 or 2 and see what you like before buying a whole bunch.
Class C, 2004/5 Four Winds Dutchman Express 28A, Chevy chassis
2010 Subaru Impreza Sedan
Camped in 45 states, 7 Provinces and 1 Territory