training - lighting fundamentals
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Lighting fundamentalsTRANSCRIPT
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April 18, 2023 Training Module - Lighting Fundamentals
MEASI ACADEMY of ARCHITECTURE
TRAINING ON LIGHTING FUNDAMENTALS
PRESENTER AANUPAM RAO
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April 18, 2023 Training Module - Lighting Fundamentals
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April 18, 2023 Training Module - Lighting Fundamentals
Light is Life
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April 18, 2023 Training Module - Lighting Fundamentals
What is Light ?
• Light is a Part of Radiant Energy which excites Human Retina and gives Visual Sensation.
• Light is a part of Electromagnetic radiation
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April 18, 2023 Training Module - Lighting Fundamentals
Electromagnetic Spectrum
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April 18, 2023 Training Module - Lighting Fundamentals
Theories of Light propagation
• Particle Theory : Units of Energy are propagated at the speed of light in straight line from light source in form of particles
• Wave Theory : Energy is propagated at speed of light in wave fashion same as that of sound.
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Visible Spectrum
Next Slide
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Rainbow
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Visible Spectrum
• Visible spectrum varies from Violet (380 nm) to Red ( 760 nm)
• On lower side of spectrum ultra violet is emitted, part of which can be converted into visible spectrum
• On higher side of spectrum Infrared is emitted which is used for medical therapy
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LIGHT AND VISION
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Photopic Vision Mesopic Vision Scotopic Vision
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Eye and Vision
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Relative Spectral Sensitivity of Eye
• Sensitivity of Eye Changes during day time and night time.
• Day time Vision – Eye more sensitive to Yellow ( 555 nm)
• Night Time Vision – Eye more sensitive to Blue ( 480 nm)
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LIGHT DIRECTION PROPERTIES
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Light Direction Properties
• Reflection
• Refraction
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Light Direction Properties
• Transmission
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Photometry
• It is the process of measurement of light, its properties and qualities.
• The basic instrument employed is called Photometer
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Solid Angle
• The concept of light and various parameters is associated with concept of solid angle ().
• It is ratio of spherical area (A) to sqaure of radius ( R )
= As/R2
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Luminous Flux
• Rate at which light is emitted by lamp.
• It is measured in Lumens (Lm)
• Its symbol is
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Luminous Intensity
• Amount of light emitted by light source in a particular direction
• It is measured in Candelas (Cd)
• Its symbol is I
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Illuminance
• It is Luminous Flux on working plane per square meter of area.
• It is measured in Lux
• Its symbol is E• E = / A
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Luminance
• It is brightness of luminous surface as perceived by human eye.
• It is measured in Cd/Sqr. M.
• Its symbol is L
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Luminous Efficacy
• It is ratio of total luminous flux emitted by lamp to total power consumed by lamp.
• It is measured in Lm/W.
• Its symbol is
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Light Output Ratio
• It is ratio of total luminous flux emitted by Luminaire to total luminous flux of bare lamp.
• It is indicated in % age.
• It is measured in controlled operating conditions.
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Light Output Ratio
Next Slide
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Glare
Direct Glare Indirect Glare
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Reflectance
• It is percentage of luminous flux reflected by a surface.
• Its Symbol is .
• Dark surfaces have lower reflectance while bright surfaces have higher reflectance.
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Uniformity
• It is expressed as ratio of minimum to average illuminance(Uniformity = Emin/Eavg)
• In some applications it is also measured as ratio of minimum to maximum illuminance (Uniformity = Emin/Emax)
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Maintenance Factor
• It is a safety factor used in application design for depreciation in terms for – Lumen Output of lamp– Deterioration of reflecting surfaces– Deterioration of reflecting properties of
surrounding surfaces– Lamp Burn Out
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Black Body Radiation
• Concept of Colour is related to concept of Black Body.
• It is a idealised enclosure which absorbs all the light incident on it and has zero reflective radiance.
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Colour Temperature
• The light colour of light source is defined in terms of Colour Temperature (Tc).
• Its unit is Kelvin ( K)• Kelvin Temperature scale begins at
absolute zero ( O °K = - 273 °C) • The colour temperature of light source is
used to denote the colour of light source by comparison with colour of standardised black body radiator
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Colour Temperature
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Colour Rendering Index (CRI)
• It is an index indicating how closely the colour of an object matches its appearance under relevant reference light source
• It is indicated on a scale from 0 to 100
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• Higher CRI reproduces surface colours accurately
• Higher CRI gives natural skin colours
Colour Rendering Index (CRI)
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• Effect of Light source with CRI = 100
• Effect of Light Source with CRI = 23
Colour Rendering Index (CRI)
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Lighting Laws
• Inverse Square Law
• Cosine Law
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Inverse Square Law
• Illumination (E) at a point on surface varies directly with luminous intensity (I) of light source and inversely with square of distance (d) between light source and surface
• E = I / d2
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Cosine Law
• Illumination (E) at a point on a surface varies as cosine of angle of incidence ()
• Hence E = I * Cos / d2
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RECOMMENDED ILLUMINATION
• FOR OFFICE AREAS: 300 LUX
WORKSTATION – > 350-400 LUX.
CONFERENCE ROOM -> 500 – 600 LUX.
• FOR INDUSTRY : 300 LUX.
PRODUCTION AREAS: 300-350 LUX.
WAREHOUSE: 200 LUX.
• STREET & EXTERIOR LIGHTING: UPTO 30 LUX.
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