Colour-tunable LED office lighting: harnessing new capabilities while saving energy

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Colour-tunable LED office lighting: harnessing new capabilities while

saving energy

Veitch, Jennifer A.; Dikel, Erhan E.; Burns, Gregory J.; Mancini, Sandra;

Newsham, Guy R.

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Colour-Tuna ble LED Offic e

Light ing: H a r ne ssing N e w

Ca pa bilit ie s w hile Saving Ene rgy

NRC Construction Portfolio

Jennifer A. Veitch, Erhan E. Dikel, Gregory J. Burns,

Sandra Mancini, & Guy R. Newsham

CORM 2012 Conference, Ottawa, 31 May 2012

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I ndividua l Cont rol

• Individual control over illuminance:

 positive affect

 performance

 higher satisfaction

 health & well-being

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Ex 1 : Sc a le M ode l

0 5 10 15 20 25 30 35 40 45 380 430 480 530 580 630 680 730 780 LIGHT A - 2855K 0 5 10 15 20 25 30 35 40 45 380 430 480 530 580 630 680 730 780 LIGHT B - 4751K 0 5 10 15 20 25 30 35 40 45 380 430 480 530 580 630 680 730 780 LIGHT C - 5769K 0 5 10 15 20 25 30 35 40 45 380 430 480 530 580 630 680 730 780 LIGHT D - 6507K 0 5 10 15 20 25 30 35 40 45 380 430 480 530 580 630 680 730 780 LIGHT E - 3728K 0 5 10 15 20 25 30 35 40 45 380 430 480 530 580 630 680 730 780 LIGHT F - 3750K

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Ex 1 : Proc e dure / Re sult s

• Scale ratings of pre-sets:

pleasantness, colourfulness, brightness

• Free choice using 5 channels

• Illuminance-constrained (450-550 lx) choice

3 3.5 4 4.5 5 5.5 6 2500 3500 4500 5500 6500 M e a n s ca le s co re CCT (K) Pleasantness Colourfulness Brightness

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Ex 1 : Choic e s

RED GREEN BLUE WARM WHITE COOL WHITE LIGHT A LIGHT B LIGHT C LIGHT D LIGHT E & F 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 _RED WARM WHITE COOL WHITE LIGHT A LIGHT B LIGHT C LIGHT D LIGHT E & F 0.2 0.3 0.4 0.5 0.2 0.3 0.4 0.5 0.6 0.7

Black Body Curve Free Constraint Individual LEDs Presets

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Ex 1 : Choic e s

Measure

Condition

Median

Mean

SD

Min

Max

Ave E (lx) Free

1042

992

391

109 1578

Ave E (lx) Const.

540

517

50

320

553 CCT (K) Free

4470

4747

2027

2832

14016

CCT (K) Const.

4280

5013

2091

2726

11321

CRI Free

87

82

16

29

95 CRI Const.

83

82

11

55

96 CQS Free

91

89

6

70

96 CQS Const.

91

89

5

76

96 Δuv Free

-0.0135

-0.0145

0.0109

-0.047

0.005 Δuv Const.

-0.012

-0.0121

0.0094

-0.042

0.006

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Ex 2 : Proc e dure

No Change

Choice

Lighting for Periods 1-2

3000 K

6500 K

3000 K

6500 K

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Ex 2 : First Spe c t rum Chose n

• Starting spectrum had no effect on colour-tuning

choices (MANCOVA not statistically significant).

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Disc ussion

• People do choose a range of spectra, but…

• what they choose depends on what’s available.

• the concept of colour-tuning is unfamiliar.

• Participants with control said they liked it.

• Control interfaces for tunable colour need

research attention.

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Ack now le dge m e nt s

• This work was supported by: Natural Resources Canada

(EcoEnergy Technology & Innovation Fund; Office of Energy

Efficiency; Clean Energy Fund); BC Hydro; Philips Color

Kinetics; Philips CANLYTE; GO Lighting, NRC Institute for

Research in Construction; and volunteer advisors from

industry and research labs.

• The project team included NRC colleagues Chantal Arsenault

and Benjamin Birt, and has included students Chris Hahn,

Derek Ludwig, Toby Pilditch, and Pavel Popov.

• Naomi Miller, Lorne Whitehead, and Howard Yaphe provided

useful advice.