Cells represent one of the toughest environments for lighting fixtures as prisoners are unsupervised for the majority of the time. In the UK there are two types of cells, “standard” and “safer”, which both follow stringent specifications set out by the MoJ.
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Custodial lighting best practice advice
Standard Cells & Safer Cells
In both cell types, luminaires must be physically robust and tamper resistant. Whereas “safer cells” require anti-ligature light fittings to prevent self-harming.
Since 1963, Designplan have led the way in designing and manufacturing vandal resistant luminaires. We have developed lighting which goes above and beyond the IK scale of measuring vandal resistance. The IK scale goes up to IK10, certifying that a luminaire can resist an impact of up to 20 joules of energy.
To resist extended periods of naked flame attack, specially designed diffusers stop holes being created which could be used to attach ligatures or store contraband. The logistics of moving prisoners from block to block to carry out maintenance is a major consideration in cell applications, especially in large prisons.
Removable Gear Trays
Luminaires that incorporate
removable gear trays not only save energy but ensure quick and easy upgrades, resulting in less disruption to prisoners and staff, see retrofit to LED.
In custodial environments this level of impact resistance is simply not adequate. Our drop-test rig creates impacts up to 250 joules of energy, 12.5 times more than an IK10 rated fitting. This rigorous testing process ensures our custodial luminaires are robustly constructed and fit for purpose in line with the MoJ’s standards.
The MoJ have a stringent set of standards for prison cell design and certification Standard cells are governed by STD/E/SPEC/021 and “Safer cells” by STD/E/SPEC/022. Both contain the requirement for lighting above the IK ratings detailed in EN 60068-2-75. Our luminaires are rated up to IK20, which is an impact equivalent to 250 joules of energy – 12.5 times more than an IK10 rated fitting (20 joules).
In “safer cell” applications, MoJ standards state that “the luminaires must be designed so as to reduce the potential for a prisoner to attach a ligature in order to attempt suicide”. We achieve this by minimising the aperture between the luminaire’s diffuser and body, using tamper proof screws and designing the body to be suitable for the application of anti-pick mastic during installation. A burns test is also required for “safer cell” accreditation. A naked flame, and abrasion from a 10mm coach bolt, is applied for up to 8 minutes to ensure the diffuser can’t be punctured.
For further lighting advice speak to our technical sales team on 020 8254 2022.
An important factor for cell lighting is the lighting control strategy. Lighting designers and consultants will need to meet specific standards and operational requirements whilst reducing energy use where practical. At Designplan we can provide control solutions for traditional switched applications and standalone luminaire operation, through to full networked
systems utilising the DALI protocol.
Best practice lighting guide
Our lighting guide identifies typical custodial applications, focusing on the principles of good lighting. We examine the benefits of robust construction, standards compliance and specific design requirements including anti-ligature luminaires for “safer” cell applications. To download your copy click on the button below.