a method of picking products in a pick - to - light system includes arranging products in first and second rows of adjacent picking locations wherein the products are available for picking . groups of totes are aligned with the picking locations where products to be picked are matched up with the applicable totes . when indicated , products are picked and placed in the indicated totes . when the indicated products are picked for each indicated tote in a given group of totes and the picks are complete for the upstream totes in a given row of picking locations , the group of totes in the given row are indexed so that the totes align with other picking locations in the given row .