Section
23 Ergonomic Lighting Design – ELD optional notation
23.1 Objectives
23.1.1 The
requirements in this Section are applicable where the optional class
notation for ergonomic lighting design is requested.
23.1.3 The
requirements in this Section do not address emergency or navigational
lighting.
23.2 Positioning and installation
23.2.2 Natural
lighting through the use of windows and doors is to be provided as
far as practicable.
23.2.3 Lights
are to be positioned, as far as practicable, in the same horizontal
plane and arranged symmetrically to produce a uniform level of illumination.
23.2.4 Lights
are to be positioned so as to reduce bright spots and shadows as far
as possible.
23.2.5 Lights
are to be positioned taking account of structures such as beams and
columns etc. so the lighting is not blocked by these items.
23.2.6 Lights
are not to be positioned in locations which would result in limited
illumination.
23.2.7 Lights
are to be positioned taking account of air-conditioning vents or fans,
fire detectors, water sprinklers etc. so the lighting is not blocked
by these items.
23.2.8 The
position of lights configured to strips or tubes is, as far as practicable,
to be at right angles to an operator’s line of sight while the
operator is located at their typical duty station.
23.2.9 Any
physical hazards that provide a risk to operator safety are to be
appropriately illuminated.
23.2.10 The
positioning of lights is to consider the transfer of heat to adjacent
surfaces.
23.2.11 Lights
are to be positioned in locations that are easy to reach for lamp
replacement or maintenance.
23.3 Luminance distribution
23.3.2 The
light levels falling on the plane in which a task is performed are
to be suitable for the type of task, i.e. they are to consider the
variation in the working planes.
23.3.3 Sharp
contrasts in illumination levels across an operator task or working
plane are to be avoided, as far as possible.
23.3.4 Sharp
contrasts in illumination levels between an operator task area and
the immediate surround and general background area are to be avoided,
as far as possible.
23.3.5 Where
required, local lighting for operational tasks is to be provided in
addition to general lighting.
23.3.6 Lighting
is to be free of perceived flicker.
23.4 Glare
23.4.2 Lights
are to be positioned so as to reduce, as far as possible, glare or
high brightness reflections from working and display surfaces.
23.4.3 Lights
are to be positioned so as to provide even illumination and minimal
glare on controls, displays and indicators.
23.4.4 Where
necessary, suitable blinds and shading devices are to be used to prevent
glare.
23.4.5 Surfaces
are to have a non-reflective or matt finish in order to reduce the
likelihood of indirect glare.
23.4.6 Where
a transparent cover is fitted over a control, display or indicator,
it is to be designed to minimise reflections.
23.5 Location of lighting controls and outlets
23.5.2 The
lighting system is to be easily maintained and operated by personnel.
23.5.3 Lighting
is to be controllable locally in accommodation and working areas,
except where this conflicts with safety requirements.
23.5.4 Light
switches are to be fitted in safe positions for personnel.
23.5.5 The
mounting height of switches is to be such that personnel can reach
switches with ease.
23.5.6 Power
outlets are to be provided where temporary, local, task lighting
will be required, except in hazardous areas.
23.6 Night vision
23.6.2 Lighting
on the ship’s superstructure is to be directed away from, and
shaded to prevent direct illumination of, the bridge windows and lookout
points.
23.6.3 Instrument
lighting is to be such that the operator can read dials and indicators
without impediment of night vision.
23.6.4 Lighting
of instruments, keyboards and controls is to be adjustable down to
zero, except for the lighting of alarm and warning indicators and
the controls of dimmers, which are to remain readable.
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