Have you ever heard of commercial light curtains? No, not those sparkly LED light curtains you see in college kids’ dorms. Commercial-grade light curtains are barriers made of infrared light that can be installed pretty much any place of entry – storefront doors, loading dock overhead doors, windows.
How Light Curtains Work
Light curtains are a great investment in safety and security for any business. With two sensor beams placed at either end of the area you want to protect, light curtains create a laser-like network of invisible infrared light beams that detect “reach-through”. Reach-through is when something interrupts the light between the sensor beams. This interruption tells the overhead door not to lower and monitors breaches of the doorway.
The great thing about light curtains is how simple yet effective they are. They’re made in tonnes of sizes, they’re easy to install, and they require little to no maintenance. All they need is a power source and a bit of tuning to the correct distance, and you’ve instantly supercharged the safety and security of your business. Their ability to see reach-through events and prevent overhead doors from closing adds safety to your business. Light curtains offer a great way to reinforce the safety and security measures of any business.
What Light Curtains Actually Do (And Don’t Do)
Light curtains aren’t physical barriers and don’t function as traditional security doors. Instead, they create an invisible detection field that responds when a person or object interrupts the beam pattern. Light curtains are most effective in environments where maintaining open access is critical, but safety monitoring is still required.
Common use cases include:
- Automated loading and unloading zones
- Conveyor and robotics cells
- High-speed production environments
- Material handling areas where physical doors would slow operations.
They aren’t designed to resist forced entry or provide physical separation in the way doors, grilles, or shutters do. As a result, light curtains are not typically used as replacements for storefront security doors or perimeter protection systems.
Light Curtains vs Physical Security Systems
While light curtains and physical security systems may appear similar in purpose, they operate in fundamentally different ways.
Physical systems such as safety doors or grilles:
- Create a physical barrier
- Restrict or delay entry
- Provide passive security when closed
Light curtains:
- Detect intrusion but don’t prevent it
- Rely on system response rather than physical resistance
- Support automation
Light curtains and physical security systems are often used together rather than interchangeably in commercial environments.
Why Light Curtains Are Ideal for Loading Docks
Light curtains and garage door safety sensors serve similar safety functions but operate in different environments and with distinct applications. When a person or object interrupts any of the many beams in the curtain, the system sends a signal to halt or reverse the closing mechanism, preventing potential accidents. This is perfect for busy commercial areas with common foot and vehicle traffic, providing comprehensive safety coverage across larger openings.
On the other hand, garage door safety sensors are usually smaller and positioned near the base of a commercial overhead door opening. These sensors use an infrared beam that, if broken, immediately stops or reverses the door’s movement. While highly effective in preventing injury and property damage, garage door sensors cover only a single point across the door’s path, typically a few inches off the ground.
In essence, light curtains offer broader, customizable protection for larger, high-traffic areas, making them more versatile for commercial hardware installations. Garage door sensors, meanwhile, are simpler but effective solutions for home and smaller commercial garage safety. Light curtains can be overkill in certain commercial situations, while a garage door safety sensor can get the job done. Light curtains can certainly be more expensive, but they can be done by your local commercial door installation team.