Fixture size and clearance are decisive in a compact space. For larger or rectangular areas, consider the overlap between multiple fixtures. Careful positioning helps avoid an intensely lit centre surrounded by dark edges.
Distinguish main lighting from supplemental lighting beneath or beside the crop. Match dimmers, controllers and cables to the electrical connections and control protocol. A matching plug alone is insufficient. When expanding, make sure hanging hardware, electrical supply and climate control suit the total power.
For larger growing areas, assess several fixtures together. Compare PPFD maps at the same mounting height and dimming level, and check the overlap between illuminated areas.