The current generation of emergency lighting, which uses low pressure sodium, is approaching obsolescence. LED technology is predominant for new installations of emergency lighting as it has excellent efficiency and optical characteristics. However, the power supplies currently used are SMPS (switch mode power supplies), which do not withstand radiation. A project to renew the emergency lighting systems within the LHC, and other tunnels of CERN's accelerator complex, has resulted in an innovative design for a radiation resistant power supply.
The main features are: input 220/240V; regulated or unregulated output; available under Open Hardware Licence V1.2; compact design; power efficient.