I guessed what he meant. But that was NOT what he SAID. I was being picky, but precise.
My point is that 1,400 watts per square meter is LOCAL to the Earth's distance from the Sun. As a spacecraft goes farther out, this figure goes down as the good-old inverse square law. It is roughly 700 watts per square meter at the distance of Mars. Much smaller farther out. This makes photovoltaic power a problem for deep space exploration.