Pick-to-Light Systems
Light-directed order fulfillment that guides operators to the right location, confirms the right quantity, and records the transaction — no paper, no scanning, no guesswork. The simplest form of meaningful warehouse automation.
The Light Tells the Operator Where to Go
Pick-to-light (PTL) is a light-directed fulfillment system. Each bin or shelf location has a small display unit mounted to it containing a light, a digital quantity display, and a confirm button. When an order is initiated, lights illuminate at the locations that need to be picked — the display shows how many units to take. The operator picks the quantity, presses the confirm button, and moves on.
There's no paper pick list to read, no barcode to scan, no screen to navigate. The system eliminates the cognitive load of traditional picking and replaces it with a simple visual prompt — which is why pick-to-light consistently achieves higher accuracy and faster throughput than paper or scan-based methods, even with less experienced operators.
Talk to a Designer
Pick-to-Light and Put-to-Light
The same hardware and technology serves two different functions depending on where in the fulfillment process it's deployed.
Directed Picking at Storage Locations
Pick-to-light modules are mounted at bin or shelf locations in the pick area. When an order is initiated in the WMS, lights activate at the locations that contain items for that order. The operator follows the lights through the pick zone, confirming each pick as they go.
- WMS releases the order; pick-to-light controller activates lights at relevant bin locations
- Operator scans or enters an order ID at the zone entry point to begin the pick
- Lit display at each bin location shows the quantity to pick
- Operator picks the indicated quantity and presses the confirm button
- Light extinguishes; system records the pick and moves to the next location
- Order is closed when all lights in the zone are confirmed — routed to pack or consolidation
Directed Sorting to Order Positions
Put-to-light reverses the logic — instead of directing a picker to locations, it directs a sorter where to deposit items from a bulk pick. Used in batch-pick operations where one picker pulls for multiple orders at once, then a sorter distributes items into individual order slots.
- Operator scans an item picked in bulk; system reads the barcode
- Light activates at the order slot where that item belongs
- Quantity display shows how many units go into that slot
- Operator deposits the units and confirms with the button press
- Repeat across all order slots until the scanned item is fully distributed
- System tracks completion — order slots with all items present are released to pack
Six Reasons Operations Choose PTL
Order Accuracy at 99%+
Light-directed picking eliminates misreads, incorrect locations, and wrong quantities — the three most common causes of picking errors in paper and scan-based systems. Accuracy rates above 99% are the norm, not the exception.
Higher Throughput Per Operator
Eliminating the time spent reading pick lists, scanning barcodes, and navigating screens adds up quickly. PTL operations consistently process 25–50% more picks per operator-hour than the methods they replace.
Shorter Training Time
New operators can be productive on a PTL system within hours, not days. The visual guidance is intuitive — follow the light, pick the quantity shown, press the button. Language barriers and reading difficulties don't affect performance.
Batch Picking Capability
PTL systems support batch picking — one operator picks for multiple orders simultaneously in a single pass through the zone. Put-to-light at the consolidation station ensures items are sorted correctly into each order.
WMS Integration
Pick-to-light controllers integrate with most warehouse management systems via standard APIs. The WMS manages order logic; PTL manages the directed pick at the bin level — neither system has to replace the other.
Real-Time Pick Data
Every pick confirmation is timestamped and recorded. Supervisors can monitor zone throughput, operator performance, and order status in real time — without walking the floor or waiting for end-of-shift reports.
How PTL Compares to Other Picking Methods
| Factor | Paper Pick List | Scan-Based (RF Gun) | Pick-to-Light |
|---|---|---|---|
| Typical Accuracy Rate | 96–98% | 98–99% | 99.5%+ |
| Throughput (picks/hr) | Lowest | Moderate | Highest |
| New Operator Training | 2–5 days | 2–3 days | 2–4 hours |
| Hands-Free Operation | No | No (scanner in hand) | Yes |
| Batch Picking Support | Manual sorting required | Limited | Native support with put-to-light |
| Real-Time Visibility | None until data entry | With WMS integration | Pick-by-pick, real time |
| WMS Integration | Manual | Standard | Standard API |
Ideal Applications for PTL Systems
E-Commerce Fulfillment
High order volumes, short lines per order, many SKUs. PTL handles the high-frequency, low-unit-count profile of e-commerce picking better than any other method at this scale.
Retail Distribution
Store-level order fulfillment with consistent SKU ranges but varying quantities per location. PTL enables fast, accurate store-pick operations without scanner or paper overhead.
Pharmaceutical Dispensing
High accuracy requirements and regulatory documentation needs. PTL provides the confirmed pick record that compliance programs require — every transaction logged with quantity and time.
Parts & Components Kitting
Assembly kitting where each kit requires multiple part numbers in exact quantities. PTL ensures complete, correct kits with a confirmation at every pick — critical where a missing part stops a production line.
Food & Beverage
Gloved operators picking in temperature-controlled environments. PTL's button-confirm design works equally well for operators who can't easily grip a scanner or handle paper in cold or wet conditions.
High-Velocity Pick Modules
Multi-level pick modules where operators work a zone and conveyors carry totes through. PTL at each zone directs the pick and confirms completion before the tote moves downstream.
How Alloy Implements PTL Systems
Pick-to-light is a hardware-plus-software project. Alloy handles both sides — from bin-level hardware mounting through WMS integration and operator training.
Zone & Flow Analysis
We map your pick zones, SKU velocity, and order profiles to determine the right zone configuration and whether pick-to-light, put-to-light, or both apply to your operation.
Hardware Design
Display unit selection and mounting layout based on bin structure. Network and power infrastructure plan — most PTL systems run on low-voltage daisy-chain wiring along shelf rails.
WMS Integration
Controller software configured and connected to your WMS via standard API. Pick logic, zone boundaries, and order release rules are set up and tested before go-live.
Training & Go-Live
Operator training — typically 2–4 hours per person. Supervised go-live with Alloy on-site through first operational period to resolve any configuration adjustments.