To Examine the Detectibility of the UEE Lighting System Underwater at Two Different Distances from the Human Eye


  1. Brooks, C.J.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN);Survival Systems Group Ltd, Dartmouth NS (CAN)
An experiment has been conducted with the Survival Systems Helicopter Universal Escape Exit. The objective was to measure the detectability of the light bars underwater with different conditions - darkness and bright ambient conditions (0 and 3000 lux); at two distances placed at 90 degrees to the human eye (1.54 and 3.1 metres) and in clear and turbid cold water (0.14 mg/litre and 2.4 mg/litre Suspended Particulate Matter) at 11-12C. Nine naval divers or Survival Systems instructors volunteered for the experiment. All subjects detected the lights at 1.54 metres under all conditions in less than 1.5 seconds. They also detected the lights under dark turbid conditions at 3.1 metres, but only four out of nine subjects detected the lights consistently at 3.1 metres in turbid water under bright ambient conditions. The conclusions are that: (a) the lights worked according to design i.e. to be seen by a survivor sitting in an aisle seat looking at 90 degrees to the window in the same row or leaning across the aisle to the window in the row on the opposite side, a distance of 1.54 metres; (b) Concurrence with Allan's work that detection of light in turbid water at 3.1 metres particularly under bright daylight conditions is unreliable.
Emergency lighting;UEE (Underwater Escape Exit)
Report Number
DCIEM-CR-2000-040;SSGL-A-98-0103 — Contractor Report (Final Report)
Date of publication
02 Mar 2000
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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