Footprint, not wattage

Will this light cover this shelf?

Watts tell you power draw. A coverage map at a stated height tells you where the light goes. Those are not interchangeable numbers.

Growing-station result

Coverage belongs to a mounting height

Match the shelf to a documented light footprint measured at the height you will use.

Edges are where averages hide

Two fixtures with enough combined square inches can overlap in the center and leave weak edges. Use the maker's map or measure plant-level light after installation.

Current primary guidance: University of Minnesota Extension, reviewed 2026, covers light intensity, distance, duration, and plant response.