Colour in artificial lighting
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- Christian Young
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2 Colour reproducton
3 Colour n artfcal lghtng Whle many dfferent factors determne how objects and materals look to the human eye under artfcal lght, colour accuracy s key and ths can be assessed n a number of ways.
4 Colour n artfcal lghtng Whle many dfferent factors determne how objects and materals look to the human eye under artfcal lght, colour accuracy s key and ths can be assessed n a number of ways. Spectral Power Dstrbuton (SPD)
5 Colour n artfcal lghtng Whle many dfferent factors determne how objects and materals look to the human eye under artfcal lght, colour accuracy s key and ths can be assessed n a number of ways. Spectral Power Dstrbuton (SPD) Correlated Colour Temperature (CCT)
6 Colour n artfcal lghtng Whle many dfferent factors determne how objects and materals look to the human eye under artfcal lght, colour accuracy s key and ths can be assessed n a number of ways. Spectral Power Dstrbuton (SPD) Correlated Colour Temperature (CCT) Colour Renderng Index (CRI)
7 Spectral Power Dstrbuton (SPD) Sunlght at mdday produces large amounts of energy across all wavelengths, so we see objects n ther true colours.
8 Spectral Power Dstrbuton (SPD) Sunlght at mdday produces large amounts of energy across all wavelengths, so we see objects n ther true colours. Ths can be llustrated n the form of a spectral power dstrbuton (SPD) curve. Relatve power for equal lumens Wavelength (nm)
9 Spectral Power Dstrbuton (SPD) Sunlght at mdday produces large amounts of energy across all wavelengths, so we see objects n ther true colours. Ths can be llustrated n the form of a spectral power dstrbuton (SPD) curve. Ths shows the energy levels and therefore precse colour output of a lght source through each wavelength across the vsble spectrum. Relatve power for equal lumens North sky (10,000k) Wavelength (nm)
10 Spectral Power Dstrbuton (SPD) Sunlght at mdday produces large amounts of energy across all wavelengths, so we see objects n ther true colours. Ths can be llustrated n the form of a spectral power dstrbuton (SPD) curve. Ths shows the energy levels and therefore precse colour output of a lght source through each wavelength across the vsble spectrum. Relatve power for equal lumens North sky (10,000k) Sun (5,300k) Wavelength (nm)
11 Spectral Power Dstrbuton (SPD) Sunlght at mdday produces large amounts of energy across all wavelengths, so we see objects n ther true colours. Ths can be llustrated n the form of a spectral power dstrbuton (SPD) curve. Ths shows the energy levels and therefore precse colour output of a lght source through each wavelength across the vsble spectrum. Relatve power for equal lumens North sky (10,000k) Sun (5,300k) Sun and sky (6,000k) Wavelength (nm)
12 SPD from dfferent lght sources Unlke natural daylght, artfcal lghtng doesn t have consstently strong energy across all wavelengths. Radant power (μw/10nn/lumens) Wavelength (nm)
13 SPD from dfferent lght sources Unlke natural daylght, artfcal lghtng doesn t have consstently strong energy across all wavelengths. Some lamps delver energy across a contnuous spectrum, but wth more power n some wavelengths than others. Radant power (μw/10nn/lumens) Wavelength (nm)
14 SPD from dfferent lght sources Unlke natural daylght, artfcal lghtng doesn t have consstently strong energy across all wavelengths. Some lamps delver energy across a contnuous spectrum, but wth more power n some wavelengths than others. Others delver energy n a noncontnuous or lne spectrum, wth sgnfcant peaks and gaps between wavelengths. Radant power (μw/10nn/lumens) Wavelength (nm)
15 Correlated Colour Temperature CCT s used to descrbe the overall colour tone of a whte lght source.
16 Correlated Colour Temperature CCT s used to descrbe the overall colour tone of a whte lght source. It s expressed n Kelvn a measure of temperature just lke Celsus and Fahrenhet
17 Correlated Colour Temperature (CCT) The scale s based on the changes n colour of an object (referred to as a blackbody radator) heated to dfferent temperatures, just lke a metal bar at a blacksmths.
18 Correlated Colour Temperature (CCT) The scale s based on the changes n colour of an object (referred to as a blackbody radator) heated to dfferent temperatures, just lke a metal bar at a blacksmths. Frst t glows red...
19 Correlated Colour Temperature (CCT) The scale s based on the changes n colour of an object (referred to as a blackbody radator) heated to dfferent temperatures, just lke a metal bar at a blacksmths....then orange... Frst t glows red...
20 Correlated Colour Temperature (CCT) The scale s based on the changes n colour of an object (referred to as a blackbody radator) heated to dfferent temperatures, just lke a metal bar at a blacksmths....then orange... Frst t glows red......then whte...
21 Correlated Colour Temperature (CCT) The scale s based on the changes n colour of an object (referred to as a blackbody radator) heated to dfferent temperatures, just lke a metal bar at a blacksmths....then orange... Frst t glows red......then whte......and fnally a blue-whte
22 CCT and lamp technologes Incandescent and halogen lamps are essentally blackbody radators. They radate energy at all wavelengths, renderng colours equally. Flament lamps are NOT gven a CCT ratng.
23 CCT and lamp technologes Incandescent and halogen lamps are essentally blackbody radators. They radate energy at all wavelengths, renderng colours equally. Flament lamps are NOT gven a CCT ratng. Non-flament lamps (e.g. dscharge and LED) don t have equal radaton across ther spectrum. CCT s used to descrbe the vsual colour produced by ths type of lamp.
24 CCT warm or cool? The K ratng refers to the temperature at whch a blackbody radator would need to be heated to produce a gven colour. 2700k
25 CCT warm or cool? The K ratng refers to the temperature at whch a blackbody radator would need to be heated to produce a gven colour. 2700k 3000k
26 CCT warm or cool? The K ratng refers to the temperature at whch a blackbody radator would need to be heated to produce a gven colour. 2700k 3000k 3500k
27 CCT warm or cool? The K ratng refers to the temperature at whch a blackbody radator would need to be heated to produce a gven colour. 2700k 3000k 3500k 4000k
28 CCT warm or cool? The K ratng refers to the temperature at whch a blackbody radator would need to be heated to produce a gven colour. 2700k 3000k 3500k 4000k 5000k
29 CCT warm or cool? The K ratng refers to the temperature at whch a blackbody radator would need to be heated to produce a gven colour. 2700k 3000k 3500k 4000k 5000k 6000k
30 CCT warm or cool? The K ratng refers to the temperature at whch a blackbody radator would need to be heated to produce a gven colour. 2700k 3000k 3500k 4000k 5000k 6000k 7000k
31 CCT warm or cool? The K ratng refers to the temperature at whch a blackbody radator would need to be heated to produce a gven colour. 2700k 3000k 3500k 4000k 5000k 6000k 7000k 8000k
32 CCT warm or cool? The K ratng refers to the temperature at whch a blackbody radator would need to be heated to produce a gven colour. WARM WHITE NEUTRAL WHITE Cool whte 2700k 3000k 3500k 4000k 5000k 6000k 7000k 8000k
33 CCT warm or cool? The K ratng refers to the temperature at whch a blackbody radator would need to be heated to produce a gven colour. WARM WHITE NEUTRAL WHITE Cool whte 2700k 3000k 3500k 4000k 5000k 6000k 7000k 8000k A 2700K lamp wll have a warm, glowng feel, as would metal heated to 2700K
34 CCT warm or cool? The K ratng refers to the temperature at whch a blackbody radator would need to be heated to produce a gven colour. WARM WHITE NEUTRAL WHITE Cool whte 2700k 3000k 3500k 4000k 5000k 6000k 7000k 8000k A 2700K lamp wll have a warm, glowng feel, as would metal heated to 2700K A 4100K lamp would be lghter n colour, lke metal heated to 4100K
35 CCT warm or cool? The K ratng refers to the temperature at whch a blackbody radator would need to be heated to produce a gven colour. WARM WHITE NEUTRAL WHITE Cool whte 2700k 3000k 3500k 4000k 5000k 6000k 7000k 8000k A 2700K lamp wll have a warm, glowng feel, as would metal heated to 2700K A 4100K lamp would be lghter n colour, lke metal heated to 4100K Temperature and feel are two dfferent thngs: A low temperature K (or CCT) ratng delvers a warm feel A hgh temperature K (or CCT) ratng delvers a cooler, brghter feel
36 CCT applcatons These dfferences n CCT mean that lamps can be used to create dfferent moods.
37 CCT applcatons These dfferences n CCT mean that lamps can be used to create dfferent moods.
38 CCT applcatons These dfferences n CCT mean that lamps can be used to create dfferent moods.
39 CCT applcatons These dfferences n CCT mean that lamps can be used to create dfferent moods.
40 CCT applcatons These dfferences n CCT mean that lamps can be used to create dfferent moods. Warm whte (2,500-3,000K) s wdely used n hotels, restaurants and resdental
41 CCT applcatons These dfferences n CCT mean that lamps can be used to create dfferent moods. Warm whte (2,500-3,000K) s wdely used n hotels, restaurants and resdental Neutral whte (3,000-3,500K) s preferred for retal and gallery lghtng
42 CCT applcatons These dfferences n CCT mean that lamps can be used to create dfferent moods. Warm whte (2,500-3,000K) s wdely used n hotels, restaurants and resdental Neutral whte (3,000-3,500K) s preferred for retal and gallery lghtng Cool whte (3,500-4,500K) s often used n schools, offces, ndustry etc.
43 CCT applcatons These dfferences n CCT mean that lamps can be used to create dfferent moods. Warm whte (2,500-3,000K) s wdely used n hotels, restaurants and resdental Neutral whte (3,000-3,500K) s preferred for retal and gallery lghtng Cool whte (3,500-4,500K) s often used n schools, offces, ndustry etc. Cold whte (5,000-7,000K) s generally lmted to specal applcaton lghtng
44 CCT applcatons There are also cultural dfferences.
45 CCT applcatons There are also cultural dfferences. Warm countres (e.g. Mddle East) prefer brghter, cooler colours
46 CCT applcatons There are also cultural dfferences. Warm countres (e.g. Mddle East) prefer brghter, cooler colours Nordc countres prefer warmer colours
47 Colour Renderng Index (CRI) Colour Renderng Index (CRI) s an nternatonal system used to rate a lamp s ablty to render eght pastel colours (R1-R8).
48 Colour Renderng Index (CRI) Colour Renderng Index (CRI) s an nternatonal system used to rate a lamp s ablty to render eght pastel colours (R1-R8). R1
49 Colour Renderng Index (CRI) Colour Renderng Index (CRI) s an nternatonal system used to rate a lamp s ablty to render eght pastel colours (R1-R8). R1 R2
50 Colour Renderng Index (CRI) Colour Renderng Index (CRI) s an nternatonal system used to rate a lamp s ablty to render eght pastel colours (R1-R8). R1 R2 R3
51 Colour Renderng Index (CRI) Colour Renderng Index (CRI) s an nternatonal system used to rate a lamp s ablty to render eght pastel colours (R1-R8). R1 R2 R3 R4
52 Colour Renderng Index (CRI) Colour Renderng Index (CRI) s an nternatonal system used to rate a lamp s ablty to render eght pastel colours (R1-R8). R1 R2 R3 R4 R5
53 Colour Renderng Index (CRI) Colour Renderng Index (CRI) s an nternatonal system used to rate a lamp s ablty to render eght pastel colours (R1-R8). R1 R2 R3 R4 R5 R6
54 Colour Renderng Index (CRI) Colour Renderng Index (CRI) s an nternatonal system used to rate a lamp s ablty to render eght pastel colours (R1-R8). R1 R2 R3 R4 R5 R6 R7
55 Colour Renderng Index (CRI) Colour Renderng Index (CRI) s an nternatonal system used to rate a lamp s ablty to render eght pastel colours (R1-R8). R1 R2 R3 R4 R5 R6 R7 R8
56 Colour Renderng Index (CRI) Colour Renderng Index (CRI) s an nternatonal system used to rate a lamp s ablty to render eght pastel colours (R1-R8). R1 R2 R3 R4 R5 R6 R7 R8 Standard CRI measurements do not take nto account saturated colours such as the deep red area of the spectrum, key to colour renderng n many aspects of retal dsplay.
57 Colour Renderng Index (CRI) Colour Renderng Index (CRI) s an nternatonal system used to rate a lamp s ablty to render eght pastel colours (R1-R8). R1 R2 R3 R4 R5 R6 R7 R8 Standard CRI measurements do not take nto account saturated colours such as the deep red area of the spectrum, key to colour renderng n many aspects of retal dsplay. R9 R10 R11 R12 R13 R14 So, where approprate, lght sources can also be rated on ther ablty to render addtonal colours (or R-values).
58 CRI values Lamps are rated on a scale of CRI (or Ra) 1-100, 100 beng the benchmark of natural outdoor lght. Generally speakng: CRI >60 s reasonable, CRI >80 s good, CRI >90 s excellent
59 CRI values Lamps are rated on a scale of CRI (or Ra) 1-100, 100 beng the benchmark of natural outdoor lght. Generally speakng: CRI >60 s reasonable, CRI >80 s good, CRI >90 s excellent Generally speakng: CRI >60 s reasonable 60
60 CRI values Lamps are rated on a scale of CRI (or Ra) 1-100, 100 beng the benchmark of natural outdoor lght. Generally speakng: CRI >60 s reasonable, CRI >80 s good, CRI >90 s excellent Generally speakng: CRI >60 s reasonable CRI >80 s good
61 CRI values Lamps are rated on a scale of CRI (or Ra) 1-100, 100 beng the benchmark of natural outdoor lght. Generally speakng: CRI >60 s reasonable, CRI >80 s good, CRI >90 s excellent Generally speakng: CRI >60 s reasonable CRI >80 s good CRI >90 s excellent
62 CRI values Lamps are rated on a scale of CRI (or Ra) 1-100, 100 beng the benchmark of natural outdoor lght. Generally speakng: CRI >60 s reasonable, CRI >80 s good, CRI >90 s excellent Generally speakng: CRI >60 s reasonable CRI >80 s good CRI >90 s excellent Whle these general ratngs are useful, numerc comparsons are only vald f lamps are close n colour temperature (CCT).
63 Questons?
64 What does a Spectral Power Dstrbuton curve ndcate? The blackbody radaton of a lght source The colour characterstcs of a lght source The accuracy wth whch colours are rendered The warmth or coolness of a whte lght
65 What does a Spectral Power Dstrbuton curve ndcate? 7 The blackbody radaton of a lght source The colour characterstcs of a lght source 7 7 The accuracy wth whch colours are rendered The warmth or coolness of a whte lght
66 Kelvn s a measurement of: Temperature Brghtness Colour Whteness
67 Kelvn s a measurement of: Temperature Brghtness Colour Whteness
68 Whch of the followng would ndcate a cold whte lght? 2,000K 3,000K 4,000K 5,000K
69 Whch of the followng would ndcate a cold whte lght? ,000K 3,000K 4,000K 5,000K
70 How many standard colours are used to defne CRI ratng? Mllons
71 How many standard colours are used to defne CRI ratng? Mllons
72 Thank you
73 Thank you esc Please press the Escape key on your keyboard to ext the presentaton
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