Pick by Light vs. Pick to Light — Are They the Same Thing?
If you've been researching light-directed picking systems, you've probably seen both "pick by light" and "pick to light" used interchangeably — and wondered whether they mean the same thing. The short answer: yes, they do. Both terms describe the same technology, the same workflow, and the same results.
This guide explains why two names exist, how pick-to-light (pick-by-light) systems work, what related terminology you'll encounter, and what to look for when evaluating systems for your warehouse.
Short Answer: They're the Same
Pick by light and pick to light refer to the same technology: a light-directed picking system where illuminated displays guide warehouse workers to the correct pick location, show the quantity needed, and confirm the pick with a button press. There is no functional, mechanical, or software difference between the two terms.
Whether a vendor calls it "pick-by-light," "pick-to-light," "light-directed picking," or simply "PTL," they are describing the same core workflow: a display lights up at a storage location, the worker picks the indicated quantity, and the system records the confirmation.
Bottom Line
If you're comparing systems and one vendor says "pick by light" while another says "pick to light," they are offering the same type of technology. Evaluate them on hardware quality, wireless vs. wired architecture, WMS integration, and total cost of ownership — not on which preposition they use.
Same Technology
Both use illuminated displays mounted at pick locations to guide workers visually
Same Workflow
Light up → pick → confirm → next task. The process is identical regardless of which term is used
Same Results
Faster picks, fewer errors, shorter training times — the outcomes don't change with the name
Why Two Names?
The dual naming convention has roots in both geography and manufacturer branding. Neither term is more "correct" than the other — they simply emerged from different contexts and both stuck.
European vs. American convention
"Pick by light" has historically been more common in European markets and among European-origin automation vendors. "Pick to light" became the dominant term in North America. As the technology globalized, both terms spread across regions and now appear interchangeably worldwide.
Manufacturer branding preferences
Different manufacturers adopted different naming conventions early on and built their marketing around them. Some vendors branded their systems as "pick-by-light" to distinguish themselves, while others used "pick-to-light." Over time, customers and industry publications adopted whichever term they encountered first.
Grammatical nuance
The preposition difference — "by" vs. "to" — suggests a subtle distinction that doesn't actually exist in practice. "Pick by light" implies the light is the method (picking is done by means of light guidance). "Pick to light" implies the light is the destination (pick and bring to the lit location). In reality, both describe the same guided workflow.
Search and SEO fragmentation
Because both terms are widely searched, vendors and publications often use both to ensure they reach the broadest possible audience. This has reinforced the existence of both terms in the market without resolving toward a single standard.
Industry Consensus
Trade organizations like MHI (Material Handling Industry) and publications like Modern Materials Handling, DC Velocity, and Supply Chain Dive use both terms without distinction. If you see "pick-by-light" in a European spec sheet and "pick-to-light" in an American one, rest assured they are describing identical technology.
How Pick-to-Light (Pick-by-Light) Works
Regardless of which name you use, the technology follows a straightforward four-step process that turns every pick into a guided, confirmed, error-free action. Here's how a pick-to-light system works in practice:
Task Arrives
Your WMS or ERP sends a pick task to the pick-to-light system via API. The task includes the storage location, SKU, and quantity needed.
Display Lights Up
The cloud display device at the target pick location illuminates its LED and shows the SKU, quantity, and any special instructions on its e-ink screen.
Worker Picks
The operator walks to the lit display, reads the pick information, and retrieves the correct item and quantity from the storage location.
Confirmation
The worker presses the button on the device to confirm the pick. The system records the confirmation, updates inventory, and sends the next task.
This process repeats for every pick in a wave, batch, or individual order. The system can manage hundreds of simultaneous pick tasks across multiple zones, with each device independently displaying its assigned task and recording its confirmation.
For facilities that also use barcode scanning, pick-to-light integrates seamlessly with RF scanners to create a closed-loop confirmation workflow — the light tells you where to go, the scanner confirms what you picked.
What to Look for in a Pick-to-Light System
Now that you know pick-by-light and pick-to-light are the same thing, the real question is: what differentiates one system from another? Here are the factors that actually matter when evaluating pick-to-light solutions.
Wireless vs. Wired Architecture
This is the single biggest architectural decision. Wired pick-to-light systems require conduit, electricians, and weeks of installation time. Wireless pick-to-light systems mount in minutes, run on batteries that last years, and can be repositioned without infrastructure changes.
Wireless systems win on deployment speed, flexibility, total cost of ownership, and scalability. The performance gap that once justified wired systems — latency — has been eliminated by modern IoT technology like Voodoo's Turbo II router.
WMS Integration
A pick-to-light system is only as useful as its connection to your warehouse management system. Look for systems that integrate via standard REST API rather than proprietary middleware or custom connectors. API-based integration means your WMS team (or your WMS vendor) can build the connection without depending on the pick-to-light vendor for development work.
Key questions: Does the system offer a documented, standards-based API? Can you send pick tasks and receive confirmations in real time? Does the integration work with your specific WMS (SAP, Oracle, Manhattan, Blue Yonder, etc.)?
Scalability
Can you start with a 20-device pilot and scale to 1,000+ without re-engineering the system? Some systems impose controller capacity limits or require zone-level infrastructure investments that create "capital cliffs" as you grow.
The ideal architecture scales linearly — each additional device is an incremental cost, not a step function. Voodoo's cloud-based platform supports unlimited devices per facility with no controller bottlenecks.
Multi-Workflow Support
The best pick-to-light systems don't just do picking. The same hardware should support put-to-light sortation, pack-to-light verification, kitting and sequencing, and cart-based picking. This means one hardware investment covers every light-directed workflow in your operation — today and as your needs evolve.
For a detailed financial analysis of what pick-to-light systems deliver in measurable returns, use the ROI calculator to model the impact for your specific operation.
Frequently Asked Questions
Is pick by light the same as pick to light?
Yes. Pick-by-light and pick-to-light are two names for the same technology — a light-directed picking system that uses illuminated displays to guide warehouse workers to the correct pick location and quantity. The naming difference comes from regional and manufacturer conventions, not from any functional difference in the technology.
What is the difference between pick-to-light and put-to-light?
Pick-to-light and put-to-light are different workflows, not just different names. Pick-to-light guides item retrieval — the display lights up where items are stored so workers know where to pick from. Put-to-light guides item placement — displays light up at sortation destinations so workers know where to place items after picking. Many facilities use both workflows on the same hardware.
Is pick-to-light better than voice picking?
They solve different problems. Pick-to-light provides a visual, location-fixed guide and works best in zones with stable SKU positions and high pick density. Voice picking directs workers via audio headset and is often preferred for large-area picking where walking long distances is unavoidable. Many warehouses use both: pick-to-light in high-density zones and voice picking in lower-density areas.
How much does a pick-to-light system cost?
Costs vary by system architecture (wireless vs. wired), number of pick locations, and integration complexity. Wireless systems like Voodoo Robotics have significantly lower total cost of ownership because they eliminate installation infrastructure, electrician labor, and ongoing cable maintenance costs. Visit the pricing page or use the ROI calculator to model costs for your specific operation.
Can pick-to-light work with my existing WMS?
Yes. Modern pick-to-light systems integrate with any WMS that can make REST API calls — including SAP, Oracle, Manhattan, Blue Yonder, Körber, HighJump, and custom-built systems. Voodoo's platform uses a standard REST API that your WMS team or vendor can integrate without proprietary middleware.
Ready to See Pick-to-Light in Action?
Whether you call it pick-by-light or pick-to-light, Voodoo Robotics delivers the fastest-deploying, most flexible light-directed picking system on the market. Get started with a pilot in days, not months.
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