Comparison Guide

    Pick to Light vs. Put to Light — What's the Difference?

    Pick-to-light and put-to-light are two sides of the same coin. One guides retrieval — lighting up where items live on shelves. The other guides sortation — lighting up where items need to go. Understanding when to use each — and how they work together — is the key to building a fast, accurate fulfillment workflow.

    This guide breaks down both workflows, compares them side by side, and explains how warehouses combine them on the same hardware for end-to-end light-directed fulfillment.

    In This Guide

    1
    What Is Pick to Light?
    2
    What Is Put to Light?
    3
    Side-by-Side Comparison
    4
    When to Choose Pick to Light
    5
    When to Choose Put to Light
    6
    Using Both Together
    7
    Frequently Asked Questions
    Retrieval Workflow

    What Is Pick to Light?

    Pick-to-light — also called pick-by-light or light-directed picking — is a fulfillment method where illuminated displays guide warehouse workers to the exact shelf, bin, or rack location where an item needs to be retrieved. When a pick task arrives from the WMS, the display at the correct location lights up, shows the SKU and quantity, and waits for the worker to confirm the pick with a button press.

    The direction of work is away from storage: the worker walks to the lit location, takes the item off the shelf, and moves it toward the next stage — whether that's a packing station, a put wall, or a shipping lane.

    💡

    Light Up

    The display at the correct shelf location illuminates with SKU, quantity, and color-coded LED

    📦

    Pick Item

    The worker goes to the lit location, reads the display, and retrieves the correct item

    ✅

    Confirm

    A button press confirms the pick and sends real-time confirmation back to the WMS

    Sortation Workflow

    What Is Put to Light?

    Put-to-light — also called sort-to-light or put-by-light — is a light-directed order sortation method. After items have been batch-picked from warehouse shelves, operators bring them to a put station where displays light up to show which order location (tote, cubby, or container) each item belongs to.

    The direction of work is toward the order: the worker scans a pre-picked item, the correct destination display lights up, and the worker places the item there. Put-to-light is how you turn a batch of mixed items into sorted, order-ready shipments.

    📡

    Scan Item

    The operator scans the barcode on a pre-picked item to identify it in the system

    💡

    Light Guides

    The display at the correct order location lights up, showing the destination and quantity needed

    🎯

    Place & Confirm

    The operator places the item in the lit compartment and presses the button to confirm

    Head to Head

    Side-by-Side Comparison

    Pick-to-light and put-to-light serve opposite ends of the fulfillment process. Here's how they compare across key dimensions.

    Pick to LightPut to Light
    PurposeGuide item retrieval from storageGuide item placement into orders
    Direction of WorkAway from shelves — items move toward packing/sortingToward orders — items move into totes, cubbies, or containers
    Typical LocationShelving, racking, flow racks in pick zonesPut walls, sort stations, packing areas
    Triggered ByWMS sends a pick task to the deviceOperator scans a pre-picked item barcode
    Order DensityOne order or batch at a time per zoneDozens to hundreds of orders sorted simultaneously
    Best ForZone picking, batch picking, single-order pickingPost-batch sortation, put walls, multi-order sorting
    Example WorkflowDisplay lights at shelf B-12 → worker picks 3 units of SKU-4421 → presses confirmWorker scans SKU-4421 → display lights at cubby #47 → worker places item → presses confirm
    Retrieval Scenarios

    When to Choose Pick to Light

    Pick-to-light is the right choice when your primary bottleneck is retrieval speed and accuracy — getting items off shelves and into the fulfillment pipeline as fast as possible.

    1

    Zone Picking Operations

    Workers stay in assigned zones and pick items as displays light up. Pick-to-light eliminates search time within each zone and keeps workers moving efficiently through high-density shelving.

    2

    Batch Picking for Multiple Orders

    Pick items for many orders in a single pass through the warehouse. Color-coded LEDs differentiate orders, and each display shows exactly what to pick and how many. Combine with put-to-light downstream for sorting.

    3

    High-Velocity Pick Faces

    When your top-selling SKUs ship hundreds of times per day, pick-to-light at those locations eliminates paper pick lists and ensures every pick is confirmed in real time.

    4

    Error-Sensitive Fulfillment

    Industries like pharmaceuticals, automotive parts, and electronics can't afford mis-picks. Light-directed picking with button confirmation creates a closed-loop process that catches errors before they leave the shelf.

    5

    Rapid Onboarding

    New hires follow the lights — no memorizing SKU locations, no reading paper pick lists, no shadowing experienced workers for weeks. Training time drops by up to 80% with pick-to-light guidance.

    Learn more about pick-to-light systems and how wireless pick-to-light eliminates wiring costs entirely.

    Sortation Scenarios

    When to Choose Put to Light

    Put-to-light is the right choice when your bottleneck is sortation — turning a batch of mixed, pre-picked items into individual, order-ready shipments.

    1

    Post-Batch Sortation

    After batch picking, items need to be sorted into individual orders. Put-to-light guides this process with zero guesswork — scan the item, the correct order location lights up, place and confirm.

    2

    Put Wall Operations

    Dedicated sort stations with dozens or hundreds of compartments. Each cubby has a Voodoo display that lights up when an item belongs there. Put walls handle 200+ simultaneous orders with near-perfect accuracy.

    3

    Retail Store Replenishment

    Distribution centers breaking bulk shipments into store-level allocations use put-to-light (put-to-store) to sort items into store-specific containers, ensuring every location gets the right product mix.

    4

    3PL Multi-Client Sorting

    Third-party logistics providers handling multiple clients on the same put wall use displays to show client, order number, and quantity — eliminating cross-client mis-sorts.

    5

    Peak Season Scaling

    Add temporary put wall stations during peak season and remove them when volume drops. Wireless put-to-light displays mount in minutes with no wiring, making seasonal scaling practical.

    Explore put-to-light systems and see how put walls provide the physical infrastructure for high-density sortation.

    Better Together

    Using Both Together

    The most efficient warehouses don't choose between pick-to-light and put-to-light — they use both. And with Voodoo's platform, both workflows run on the exact same hardware.

    1

    Pick with Light

    Workers move through pick zones where Voodoo displays light up at each shelf location, guiding fast, accurate retrieval of items across multiple orders in a single batch.

    2

    Sort with Light

    Batch-picked items arrive at a put station. Workers scan each item and the correct order compartment lights up on the put wall — turning a mixed batch into sorted, order-ready shipments.

    3

    Ship with Confidence

    Every pick was guided. Every sort was confirmed. Orders are complete, accurate, and ready to ship — with a full audit trail from shelf to box. Add pack-to-light for final verification.

    Same Hardware, Two Workflows

    Voodoo's IoT cloud display devices work for both pick-to-light and put-to-light. The same battery-powered, wireless displays that light up at shelf locations for picking can be mounted on put wall cubbies for sortation. No separate systems, no duplicate hardware investments — one platform that handles the entire fulfillment cycle.

    Pair both workflows with RF scanners for scan-and-confirm execution, or add pack-to-light for final ship verification at the packing station.

    FAQ

    Frequently Asked Questions

    What is the difference between pick-to-light and put-to-light?

    Pick-to-light guides item retrieval — displays light up at shelf locations where items are stored, guiding workers to pick the right item and quantity. Put-to-light guides item placement — after items are batch-picked, displays light up at order locations (totes, cubbies, or containers) to show where each item should be sorted. Pick-to-light handles the first half of fulfillment (gathering); put-to-light handles the second half (sorting).

    Can you use pick-to-light and put-to-light together?

    Yes — and many warehouses do. The most common combined workflow uses pick-to-light in the pick zones to batch-pick items across multiple orders, then put-to-light at a sort station or put wall to sort those items into individual orders. With Voodoo's wireless platform, both workflows run on the same hardware, so there's no duplicate investment.

    Do pick-to-light and put-to-light use the same hardware?

    With Voodoo Robotics, yes. The same IoT cloud display devices work for both workflows. The device behavior — whether it guides a pick or a put — is controlled by the software and your WMS integration. This means you can deploy devices for pick-to-light today and add put-to-light later without buying different hardware.

    Which is better for eCommerce fulfillment?

    Both are valuable, but they solve different problems. Pick-to-light improves retrieval speed across your pick zones. Put-to-light improves sortation speed at the pack station. For high-volume eCommerce operations that batch-pick and then sort, using both together delivers the biggest throughput gains. For smaller operations with fewer simultaneous orders, pick-to-light alone may be sufficient.

    How does put-to-light work with a WMS?

    Voodoo's put-to-light system connects to any WMS through a simple REST API. When a worker scans a batch-picked item, the WMS tells the Voodoo server which order location should light up. After the worker confirms the put with a button press, the confirmation flows back to the WMS in real time. Learn more about WMS integration.

    Ready to Light-Direct Your Fulfillment?

    Whether you need pick-to-light, put-to-light, or both — Voodoo's wireless platform deploys in hours, not months. Talk to our team to find the right configuration for your operation.

    Request a DemoView PricingCalculate ROI
    Related Guides

    Continue Reading

    Pick to Cart vs. Put Wall

    Compare mobile cart-based picking with stationary put wall sortation

    Pack to Light vs. Put to Light

    Understand the difference between sortation and ship verification

    Pick by Light vs. Pick to Light

    Are they the same thing? Yes — here's the terminology guide

    Pick to Light System

    Complete guide to Voodoo's wireless pick-to-light platform

    Put to Light

    Wireless put-to-light systems for high-speed order sortation

    Put Walls

    Physical sort stations powered by light-directed displays

    Pick to Cart

    Mobile cart-based picking with light-guided displays

    WMS Integration

    How Voodoo connects to any WMS via REST API

    RF Scanners + Pick to Light

    Combining barcode scanning with light-directed workflows