In practical terms, we typically design for a certain footcandle level for the parking lot, say, 2 footcandles. We determine the area to be lit, for instance, a 40 by 60 parking lot. Knowing these two elements, we can rewrite our equation and solve for lumens:
For the parking lot, we would need 4,800 lumens. All that's left to do is pick the number and type of fixtures to give you enough lumens. It's just that simple!
