Agreed, lumens is used more often because it relates to total light
output better than lux (which is more of a directional, one-spot measurement).
I think our little trailers are small enough that a lower light output (even 1/3 or 1/2 less than incandescent) emitter still produces plenty of light to see by. I find two places where I want more light: over the stove and over my book. So I left the incan bulb in over the stove, and I added a couple of directional LED reading lights
in the places where I sit or recline.
Keep in mind, also, that you can turn on 6 or 8 LEDs in your trailer and probably draw less current than you would with one incan bulb. So in the rare instances when you want more light, you can easily get it.