Abstract
Photoluminescent strips forming a Low Location Lighting (LLL) system are the primary method for marking escape routes on passenger ships. The LLL system can be built as a self-luminous system (powered by electricity) or made as a series of strips made of photoluminescent materials, which glow and indicate the escape route after the loss of basic and emergency lighting. To ensure correct visual guidance, these strips must be installed at specific locations in the passageways and achieve appropriate photometric parameters after a certain time from their activation. The properties of the LLL system depend on the type of luminescent material used, the excitation source, and the exposure parameters. This paper presents the results of laboratory tests on two types of photoluminescent materials used for the construction of LLL systems. We recorded the change in luminance after the loss of excitation and measured the luminance values obtained 10 and 60 min after the loss of excitation under exposure to light sources commonly used for interior lighting on passenger ships. It turns out that replacing fluorescent lamps with LED lamps can reduce the luminance of the LLL system.
Highlights
Agnieszka Wolska andThe International Convention for the Safety of Life at Sea 1974 SOLAS [1] sets safety regulations for all vessels
The Low Location Lighting (LLL) system based on photoluminescent strips is widely used on passenger ships and ferries due to its reliability
Tests of LLL strips under laboratory conditions are performed according to the requirements of the standard [2] at an illumination level of 25 lx at the material surface obtained from a fluorescent lamp with a colour temperature of 3000 K
Summary
The International Convention for the Safety of Life at Sea 1974 SOLAS [1] sets safety regulations for all vessels. According to the provisions of the Convention, all passenger ships designed to carry more than 36 passengers must have a Low Location Lighting (LLL). This is the last safety system that should allow for finding the escape route even in heavy smoke For this reason, the electric lighting system and photoluminescent strips are located at a low height above the ground. Except for cabin doors, recesses less than 2 m wide, and connections to other passageways, the photoluminescent strips shall be so placed as to provide continuous visual information on the escape route after the loss of basic lighting. The marking of doors on escape routes should on both sides if it is more than 2 m wide.
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