Light well
A light well (or lightwell) is an architectural feature that can be used to take natural light into the interior spaces of a building. It takes the form of a vertical shaft within the volume of a building that typically penetrates from roof level down to lower levels, allowing the transmission of natural light to areas that would otherwise require artificial lighting. Light wells can also be used to promote ventilation.
Light wells may be open to the elements at the top (i.e. without a roof), with internal windows around its perimeter, or it may be open internally with glazing at the top.
The advantages of light wells are that they can reduce the electric lighting requirements of a building, as well as providing an open space that can be used as an outdoor area or garden.
A large light well may be referred to as an atrium.
Small, highly-reflective light wells that 'collect' light and transmit it to the interior of a building may be referred to as daylight systems or light tubes.
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