Illuminating Custodial Cells Safely

Custodial cells are some of the toughest spaces to light. Every luminaire needs to deliver safety, strength, and long‑term reliability. Because of this, lighting in these environments must follow strict standards and be strong enough to withstand constant use.

At Designplan, we engineer ligature‑resistant and tamper‑resistant luminaires specifically for police custody suites and prison estates. Each product is designed to reduce potential ligature points, withstand high impact resistance, and remain dependable over decades of operation. In addition, our ranges align with current MoJ requirements for both reduced ligature and ligature‑resistant cells, while long‑life LED systems and maintainable gear trays help minimise operational disruption.

Lighting Custodial Environments: Safety by Design

Custodial lighting must deliver extreme robustness, tamper resistance, and ligature‑resistant form factors. As a result, these characteristics protect both staff and occupants while ensuring reliable day‑to‑day operation.

Compared to lighting in commercial buildings, custodial luminaires need to be much stronger and far more secure. Because of this, several design factors become essential. In particular, impact resistance, tamper resistance, and ligature‑resistant form factors play a major role.

Extremely Robust
EN 62262 defines impact ratings up to IK11 (50 joules), but custodial settings demand more. That’s why we test our luminaires up to IK20 (250 joules), offering five times the impact resistance of standard IK11 fittings. Because of this, the luminaires can resist vandalism, intentional tampering, and attempts to create ligature points.

Tamper-Resistant Construction

In secure environments, prisoners may attempt to dismantle or interfere with lighting. To prevent this, custodial luminaires must incorporate:

Tamper‑proof screws and minimal gaps between diffuser and body
Compatibility with hard‑setting (anti‑pick) mastic, as referenced in ETN 023 and MoJ mastic list 000000‑MOJ‑0054‑XX‑T‑K‑8111
Flame‑resistant diffusers engineered to handle naked flame, abrasion from a 10mm coach bolt, and heavy impact

Together, these features reduce the chance of hiding contraband or using the fitting for escape attempts. In addition, they help the luminaire stay safe and reliable over time.

Ligature Resistance Profiles

MoJ standards for ligature‑resistant cells require luminaires that actively reduce self‑harm risks. To achieve this, fittings must include:

Smooth, uninterrupted external profiles
Minimal apertures
Products tested and granted formal LIG ratings
Verified compliance through burns and abrasion testing

As a result, these designs remove opportunities for ligature attachment.

Understanding MoJ Custodial Cell Terminology & Specs

Because custodial terminology has changed over time, it is helpful to clarify the current definitions:

Reduced ligature (previously “standard cells”)
Ligature‑resistant (previously “safer cells”)

Key references include:

Spec 22 (STD/E/SPEC/022) — a core specification, cited in STD 71, STD 80 and several MoJ design guides
Spec 21 (STD/E/SPEC/021) — used less frequently as standards shift toward ligature‑resistant solutions

Reducing Operational Disruption

Maintenance in custodial environments is difficult, as taking a cell out of service can slow operations and reduce capacity. As a result, custodial luminaires need to be simple and efficient to maintain. To support this, our products include:

Removable and easy‑to‑maintain gear trays
High‑efficiency, long‑life LED systems
A 30‑year design life

As a result, facilities experience less downtime, lower costs, and improved safety.

Designed for Safety. Engineered for Longevity.

Since 1963, Designplan has led the custodial lighting sector by creating products that meet the specific needs of high‑risk environments.
Our custodial luminaires deliver:

Maximum impact resistance
Ligature-resistant protection
Verified compliance with key MoJ standards, including Spec 22
Proven reliability across the custodial estate
Long‑life, energy‑efficient LED performance

Because of these benefits, they help create safer conditions for both staff and prisoners while supporting consistent, long‑term operation.

Technical Support

The MoJ sets strict performance and safety standards for prison cells. Reduced ligature cells follow STD/E/SPEC/021, while ligature‑resistant cells follow STD/E/SPEC/022. Both require luminaires to exceed the IK ratings outlined in EN 60068‑2‑75. Our fittings meet IK20, delivering impact resistance of up to 250 joules, five times stronger than IK11’s 50 joules.

In ligature‑resistant cells, MoJ standards also require luminaires that minimise opportunities to attach a ligature. To achieve this, we::

Tight body‑to‑diffuser interfaces
Tamper‑proof screws
Compatibility with anti‑pick mastic
Burn tests involving direct flame and abrasion from a 10mm coach bolt for up to 8 minutes

Consequently, these tests ensure the diffuser cannot be punctured or damaged.

FAQs

What makes custodial cell lighting different?

Custodial environments require luminaires that are far stronger than typical commercial fittings. Standard IK11 ratings allow resistance up to 50 joules, but custodial cells need significantly higher impact resistance, up to 250 joules, five times stronger than IK11. This ensures the lighting can stand up to vandalism, tampering, and attempted breaches

What is anti-ligature lighting?

Anti Ligature Lighting (now known as Ligature resistant lighting) is designed to lower the risk of self harm or suicide by removing points where a ligature could be attached. Our fittings are tested to reduce these risks in tough environments, such as custodial cells.

Why does custodial lighting require higher impact ratings?

In custodial cells, prisoners are often unsupervised for long periods. Luminaires must handle extreme deliberate force or vandalism. For this reason, Designplan test fittings up to 250 Joules, which is equivalent to IK20 performance, far greater than the IK11 limit defined on the standard IK scale.

Why is maintenance such a challenge in custodial environments?

Maintenance requires moving prisoners from cell to cell, or block to block, which creates risks and operational disruption.
To address this, custodial luminaires incorporate removeable gear trays, enabling quick upgrades or repairs, cutting downtime, and improving safety for staff and inmates.

Why are LED gear tray upgrades important in prison environments?

LED upgrades reduce energy use, extend product lifespan, and minimise the need for disruptive maintenance visits. However, light distribution must match original specifications to ensure continued compliance with MoJ emergency lighting requirements.

Best Practice Lighting Guide

Our lighting guide highlights common custodial applications, emphasising principles of effective lighting. We explore the advantages of sturdy construction, adherence to standards, and tailored design needs, such as anti-ligature luminaires for “Ligature‑resistant” cell usage. Download your copy by clicking the button below.

Download Our Custodial Lighting Guide