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    Basics of Light - Philips

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    Betinol Rachel
    Light is electromagnetic radiation that allows for vision. It is measured using units like lumens, luminance, and illuminance. Different light sources have varying color rendition and color temperature. Proper lighting levels are important for different tasks and environments.

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    Basics of Light - Philips

    Uploaded by

    Betinol Rachel
    100 views23 pages
    Light is electromagnetic radiation that allows for vision. It is measured using units like lumens, luminance, and illuminance. Different light sources have varying color rendition and color temperature. Proper lighting levels are important for different tasks and environments.

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    © © All Rights Reserved

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    Light is electromagnetic radiation that allows for vision. It is measured using units like lumens, luminance, and illuminance. Different light sources have varying color rendition and color temperature. Proper lighting levels are important for different tasks and environments.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    100 views23 pages

    Basics of Light - Philips

    Uploaded by

    Betinol Rachel
    Light is electromagnetic radiation that allows for vision. It is measured using units like lumens, luminance, and illuminance. Different light sources have varying color rendition and color temperature. Proper lighting levels are important for different tasks and environments.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    You are on page 1of 23

    Lighting Fundamentals

    Clifford Jison
    October 28, 2006
    Content

    • Introduction to Light
    • Basics of Light
    • Units of Measurements in Lighting

    After the discussion, you’ll have a better


    appreciation of Lighting.

    2
    Light is Powerful

    • No life without Light.

    • We evolved because of light.

    3
    Light is Powerful

    • It controls, regulates our Planet’s functions.

    • Source of Energy.

    4
    Basics of Light

    5
    What is Light?

    • Light is Electromagnetic Radiation travelling in space

    • Light creates ‘Vision’, when processed by our eyes &


    brain

    • Light is a perceived and felt phenomenon

    6
    Light is Electromagnetic Radiation travelling in space

    Spectrum of
    Electromagnetic
    Radiation shows
    the extent of visible
    light
    * Nanometer (nm) = mm/1,000,000
    (mm is millimeter)

    7
    Light is Electromagnetic Radiation travelling in space

    • Light waves consist of colours

    • Light waves split into its component


    colours by passing through a glass
    prism

    • Like “Rain & Sunlight” = Rainbow

    • Each colour is identified by its


    “Wavelength”

    8
    Light is Electromagnetic Radiation travelling in space
    380 780
    nm nm
    Colour Wavelength
    Impression (nm)
    Red 630-780
    Orange 600-630
    Yellow 565-600
    Green 500-565
    Blue 435-500
    Violet 380-435
    9
    Light creates ‘Vision’ when processed by our eyes & brain

    • Light hitting the Retina


    activates its Rods & Cones
    • Rods (for shape) and Cones
    (for colour) create an electric
    signal
    • Signal transmitted to the
    brain via optic nerves, thus,
    making us see

    Vision is a result of a process between Light, Eye & Brain.


    Together, they help us see the world around us.
    10
    Light creates ‘Vision’ when processed by our eyes & brain
    Spectral Eye Sensitivity Curve
    Vision has different sensitivities to Colours.
    This forms the basis of different Lamps.

    “NIGHT TIME” “DAYTIME” Vision


    Vision

    * Photopic – Day time vision *Scotopic – Night time vision


    11
    Light is a perceived & felt phenomenon

    Color Rendition

    Color Temperature

    12
    Colour Rendition
    The ability of Light to show Color.

    Colour perception Colour perception under


    under a ‘Low Pressure an ‘Incandescent Lamp’
    Sodium Lamp’

    13
    Colour Rendition

    Blue Green

    Yellow Red

    Sodium HP Incandescent
    Lamp Lamp 14
    Colour Rendition
    - The Sun is 100% Color Rendition

    Colour Rendition of typical lamps


    Lamp Type CRI or Ra
    Incandescent 100
    Fluorescent Colour 33s >50
    Fluorescent Colour 54s 70
    Fluorescent Colour 80s 85
    Fluorescent Colour 90s >95
    High Pressure Sodium(SON) 23
    High Pressure Mercury (HPL) >40
    Low Pressure Sodium(SOX) -44
    15
    Color Temperature
    Color of Light

    COOL WARM

    16
    Color Temperature

    Colour Temperature (Tc) of Lamps


    2700K Incandescent White
    3000K Warm White
    3500K White
    4000K Cool White
    5000K Daylight
    6500K Cool Daylight

    17
    Units and Measurements
    in Lighting

    18
    Luminous Flux

    - Total light output per second

    Unit : Lumen (lm)


    Symbol : φa

    19
    Luminous Flux

    Bicycle Head Lamp 3W 30 lm


    Incandescent Lamp GLS 100W 1,360 lm
    Compact Ess 14W 900 lm
    Fluorescent Lamp
    Fluorescent Lamp TL-D 36W 3,350 lm

    High Pressure SON-T Plus 10,500 lm


    Sodium Lamp 100W

    Low Pressure SOX-E 18W 1,800 lm


    Sodium Lamp
    High Pressure HPL-N 125W 6,200 lm
    Mercury Lamp

    20
    Luminance & Illuminance
    Basis of Perception - Luminance is ‘Brightness’
    - Dependent on surface
    - Represented by ‘cd’
    Illuminance
    Lumens - Illuminance: ‘Process of lighting up’
    - Non-Dependent on surface
    - Dependent on inter-reflection
    - Light measured ‘off’ surface

    Unit : Lux (lx)


    Symbol : E

    Luminance 1 Lux = 4 Full Moons


    (Brightness) 1 Full Moon = .25 Lux (..eye can see!)
    21
    Recommended Illuminances

    Illuminance Area of activity


    (lux)
    100 Circulation areas
    300 Rough industries, Lecture theater
    500 Laboratories, Computer rooms, Super
    markets, Medium-type industrial work
    750 General offices, Electronic industry
    1000 Drawing offices, Precision industry
    30,000 Task lighting in Operating theater

    22

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