How Many Lights Do I Need In My RV?

There are many units of measurement, metric and imperial, that I am very familiar with. But lumens is such an ephemeral value that shopping for lighting becomes very confusing. Lumens are a measurement of brightness. The more light a bulb puts out, the more lumens and power. As there is no "one size fits all" solution for lighting, there's a lot of math and a bit of art to determining what lighting is appropriate for a space.