Design and radiation tests on a LED based emergency evacuation directional lighting
2018 March 05
2018 March 20
A LED (Light Emitting Diode) based directional lighting system has been designed to indicate
the best evacuation direction for applications like the Large Hadron Collider (LHC) tunnel. The
design includes constraints for redundancy required by safety systems and for components
selection by radiation effects. Most of the literature for radiation effects on LEDs concern digital
communications systems, although some recent reports do exist for visible spectrum power LEDs
and the reduction in light output versus dose is coherent with the results presented in this paper.
Prototype lighting units were irradiated in CERN’s CHARM facility up to a Total Integrated Dose
(TID) of 870 Gy and no failures were observed. This paper describes the basic design, presents
field tests and the effects of radiation on the LEDs luminance.