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Methods of Illumination

General lighting is designed to provide uniform illumination throughout an area, while task lighting provides stronger light for visually demanding tasks like reading. There are also accent, local, indirect, semi-indirect, semi-direct, and direct lighting options. Lighting is categorized by the percentage of light emitted above or below horizontal planes, and different types use lamps, lenses, and reflectors to achieve various light distributions. The primary purpose of lighting is to provide sufficient illumination for visual tasks.

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Geri Adriana Sonza
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101 views3 pages

Methods of Illumination

General lighting is designed to provide uniform illumination throughout an area, while task lighting provides stronger light for visually demanding tasks like reading. There are also accent, local, indirect, semi-indirect, semi-direct, and direct lighting options. Lighting is categorized by the percentage of light emitted above or below horizontal planes, and different types use lamps, lenses, and reflectors to achieve various light distributions. The primary purpose of lighting is to provide sufficient illumination for visual tasks.

Uploaded by

Geri Adriana Sonza
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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ACOUSTICS AND LIGHTING SYSTEMS

Methods of Illumination
Lighting
- The science, theory, or method of providing
illumination through the use of electric lamps
Types of Lighting:
General lighting
- Deisnged to provide a uniform level of illumination
throughout an area Task lighting
- Often called, “ambient lighting” illuminating an area - Designed to provide strong illumination for a
thoroughly visually demanding activity, such as reading or
- The aim is for general lighting is to create an sewing
illumination as natural as possible - Intended for performing specific tasks that needs a
higher level of brightness compared to general
lighting
- Tasks involves: Reading, writing, food
preparation/cooking

Accent lighting
- Calls the attention to a particular object or feature
in the visual field. Or that forms a decorative pattern
on a surface
- Often. Its main objective is pure aesthetics
- Its intention is to catch the attention of the viewer
to a point of interest and build a visual accent

Local lighting
- Designed to provide a relatively high level of
illumination over a small area, with a surrounding
area of lower intensity of spill light
- Local lighting illumination does not contribute to the
general lighting
Lighting
- Primary purpose: to provide sufficient illumination
for the performance of visual tasks
- The recommended levels of illumination reveals the
amount of lighting needed to be supplied to specific
tasks. Furthermore, this amount of lighting affects
how a space is revealed.

Types of lighting system


- Luminaires may be categorized according to the
percentage of light emitted above and below a
horizontal plane. The actual light distribution is
determined by the type of lamp, lens, and reflector
housing used. General diffuse lighting
- Lighting form luminaires that emit an approximately
Indirect lighting equal distribution of light upward and downward
- Lighting in which luminaires distribute 90% to 100% - An opal diffusing globe
of the emitted light upward - Gives light in a directions
- All of the light reaches the horizontal working plane
indirectly via reflection from the ceiling
- Avoid glare and prevent shadow
- Source of light must be suspended atleast 18” and
a ceiling height of 2.85m

Direct-inderect lighting
Semi-indirect lighting - General diffuse lighting in which little light is emitted
- Lighting in which luminaires distribute 60% to 90% in the horizontal plane of the luminaires
of the emitted light upward. - An open top luminous side and bottom luminaire
- Allows higher level of illumination without
undesirable brightness contrast between fixture and
surroundings along with lower ceiling brightness.
Semi-direct lighting
- Lighting in which luminaires distribute 60% to 90%
of the emitted light downward
- Applicable to offices, classrooms, shops, and other
working areas

Direct lighting
- Lighting in which luminaires distribute 90% to 100%
of the emitted light downward on the surface or area
to be illuminated
- Ceiling illumination is due to light reflected from the
floor and room furnishings
- Pendant fixtures are used to lower the apparent
ceiling of a poorly proportioned room or to hide
pipeline or ductwork

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