Lighting Level requirements

Lighting Level requirements


in this nugget we will learn the basic
concept of lighting level requirements lighting
level is used to specify the amount of light present the natural illuminance can range
from a few tenths of a lux under the moonlight in which human
perception is just possible to as high as 100,000 lux in the middle of summer out in the open the levels of lighting accepted as
being satisfactory under artificial lighting are really
very low 3 to 25 lux for road lighting 10 to 15 lux on average for mood
lighting indoors and 300 to 1,000 lux for reading and working amount of daylight falling on an object
in combination with the luminance pattern of reflectance of the object play a
major role in what we see it is the lighting level that
determines the adaptation state of the eye in addition the risk a fault and the
duration of the task play an important role in determining
the lighting level required therefore the more difficult the visual
the higher the lighting level needed the average luminance on the most
relevant plane is often the horizontal plane that is
used as the measure for lighting level often the plane on which the lighting
level is specified is the horizontal plane indoors it is usually measured on the
working areas for example the desks but where the precise working area is
not known the lighting level on an imaginary
horizontal surface about 75 centimeters above the floor is specified in road lighting it is the road surface
and in sports lighting the horizontal playing area but in many
situations the lighting of vertical objects is
important as well for example in sports lighting the
illuminance on specified vertical planes is used as
an extra criterion to guarantee a proper
view of the vertical players and in residential areas where crime
could be a problem the so-called semi cylindrical illuminance is also sometimes specified as a
lighting criterion to facilitate facial recognition this is because the human face more
resembles a half cylinder than a vertical plane
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