Pick-to light systems consist of lights and LED displays for each pick location. The system uses software to light the next pick and display the quantity to pick. Pick-to-light systems have the advantage of not only increasing accuracy, but also increasing productivity. Since hardware is required for each pick location, pick-to-light systems are easier to cost justify where very high picks per SKU occur. Carton flow rack and horizontal carousels are good applications for pick to light. In batch picking, put-to- light is also incorporated into the cart or rack that holds the cartons or totes that you are picking into. The light will designate which order you should be placing the picked items in. See < href="/en/inventory-managment" class="q">Order Picking.