SecurityWorldMarket

31/03/2022

Perimeter surveillance – Part 4 of 6

Things to consider when specifying lighting for perimeter security

Perimeter fence lines often cover large areas, so distance and coverage of an illuminator are two of the main things for a specifi er to consider.

Perimeter fence lines often cover large areas, so distance and coverage of an illuminator are two of the main things for a specifi er to consider.

Raytec is the world leader in LED lighting for safety and security, and the company behind the VARIO2 range of award-winning LED illuminators, designed to enhance the performance of any security system.

In this article, their experts point out important elements to consider when it comes to using LED illuminators in perimeter security applications.

These are the five important things to consider when specifying lightning for perimeter security applications, according to the experts from Raytech.

1. Types of Light

Infrared (IR) illumination is the most common type of light used around a perimeter fence line. IR omits zero light pollution, but crucially, it allows the camera to capture night-time images covertly, without alerting potential intruders or giving them light to work by. Once the camera has detected an intruder, the site may choose to raise an alarm. This is where white-light is often deployed; automatically triggered as a fl ashing deterrent to ward off an intruder or used to provide accurate positive identification of the intruder. Only using white-light when it’s needed ensures light pollution is kept to a minimum while still providing optimum levels of security. In some instances, white-light may still be chosen to illuminate the entire perimeter, but due to light pollution, and the fact that the camera is more receptive to IR, means white-light is often preferred as a deterrent.

Another option that specifiers should consider is the use of hybrid illuminators. Hybrid illuminators provide an all-in-one solution, combining both IR and white-light into a single unit. This means one illuminator can be used for both covert surveillance, and as a white-light deterrent. Hybrid allows the user to control the wavelength and switch seamlessly between IR and white-light.

2. Quality and Distance

Vario2 range uses Hot-Spot Reduction Technology to deliver a highly diffused, elliptical beam shape.
Vario2 range uses Hot-Spot Reduction Technology to deliver a highly diffused, elliptical beam shape.

Perimeter fence lines often cover large areas, so distance and coverage of an illuminator are two of the main things for a specifier to consider. It is also equally important to consider how the illuminator will assist the camera in obtaining the highest quality images. Illuminators able to deliver longer distances may allow cost savings by reducing the total number of illuminators across the site. It may also reduce costs in terms of the numbers of cameras, lighting columns, cabling and other ancillary equipment needed as part of the installation.

Using illuminators that reduces hot spots and provide an even image across the entire scene is also a way to ensure high image quality. Raytec’s Vario2 range uses Hot-Spot Reduction Technology (HRT) to deliver a highly diffused, elliptical beam shape, which targets the light where it’s needed. This supports longer distances, minimises light wastage, and ensures even distribution of light throughout the scene. The HRT system also prevents overexposure of foreground objects; light uniformity is crucial in ensuring hot spots are minimised.

3. Hardware Integration

Hardware integration is an important factor to consider as modern perimeter surveillance systems often consist of several IP enabled devices, intended to work together to provide high levels of security. Typically, these include IP cameras, passive infrared sensors (PIR), laser detectors and fibre optic fence sensors. For applications using these kinds of devices, specifying an IP enabled illuminator capable of providing an automated lighting response, is essential. For example, if a PIR sensor detects movement from an intruder, an alarm could be raised to automatically turn on the white-light (so the intruder can be positively identified) or put the lamps into deterrent mode (to ward off the intruder).

4. Software Integration

In terms of specifying an illuminator, it’s important to choose one which can be integrated with the Video Management Software (VMS) used by the site. For example, if a site is using Milestone’s Xprotect platform, the chosen illuminator should be cable of being integrated into that system, so it can be controlled easily and lighting responses set-up to be triggered by other detection devices. If the lighting system cannot be integrated with the VMS used on site, it could have a detrimental impact on the efficiency of the security system.

5. Camera Analytics

Using video analytics is an effective way to determine if unwanted or suspicious behaviour is occurring in a camera’s field of view. However, camera analytics are only as effective as their ability to provide a consistent, clear image. This is where lighting plays an important role. Using analytics requires often increased light levels compared to standard applications. Darkness will seriously affect the performance of the used video analytics and create false alarms. In terms of specifying an illuminator, it’s important to choose one which can be integrated with the security management platform in use by the site. For example, if a site is using Milestone’s Xprotect platform, the chosen illuminator should be capable of being integrated into that system, so it can be controlled easily and lighting responses set up to be triggered by other detection devices.

Note: This editorial article has primarily been produced for the security trade magazine Detektor in collaboration with Securityworldmarket.com.


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