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LED systems could benefit individuals, employers and environment
Veitch, Jennifer A.
LED Systems Could Benefit Individuals,
Employers, and Environment
NRC Construction
Dr. Jennifer A. Veitch
Advanced Energy 2013, April 30-May 1, New York
Research Question
Can office lighting
go beyond providing
adequate conditions
for seeing?
Can it be smart and
sustainable?
→ Yes.
Light Right Albany Experiments
Temps, 1-day
exposure
Tasks &
questionnaires
Linked
mechanisms map
BC 1 - Parabolic Louvers
Best Practice @ 600 lx
Best Practice +
Switchable Control
Dimming
Control
E
xp
e
rim
e
n
t #
1
E
xp
e
rim
e
n
t #
2
Best Practice @ 400 lx
BC 2 - Lensed Troffers
Light Right Albany:
Linked Mechanisms Map
Source: Veitch, J. A., Newsham, G. R., Boyce, P. R., & Jones, C. C. (2008). Lighting appraisal,
well-being, and performance in open-plan offices: A linked mechanisms approach. Lighting Research and
Technology, 40(2), 133-151. Available at:
http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=shwart&index=an&req=20377550&lang=en
.
Ottawa 2002 Experiment:
Structural Model
Source: Veitch, J. A., Stokkermans, M. G. M., & Newsham, Guy R. (2013). Lighting lighting
appraisals to work behaviors. Environment and Behavior, 45(2), 198-214.
LS
OS
IC
NRC Field Study: Lighting System
LS
OS
IC
NRC Field Study Results
Source: Galasiu, A. D., Newsham, G. R., Suvagau, C., &
Sander, D. M. (2007). Energy saving lighting control
systems for open-plan offices: a field study. Leukos, 4(1),
7-29
Available at:
http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=shwart&index=an&req=20377469
&lang=en.
Veitch, Advanced Energy 2013 / slide 7
0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00
Conventional system -full power (no controls) WS-IC - full power (no
controls) WS-IC - actual use
(with controls)
Workstation average daily energy use [kWh]
69%
42% 47%
Light Right Field Study: Model Test
Host organization renovation
•
Old lighting: parabolic-louvered
luminaires
•
New lighting: workstation-specific
direct-indirect with individual control
•
Furniture change – dark to light
Veitch, J. A., Newsham, G. R., Mancini, S., & Arsenault, C. D. (2010). Lighting and office renovation effects on employee and
organizational well-being (NRC-IRC Research Report RR-306). Ottawa, ON: NRC Institute for Research in Construction.
Available at
:
http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=shwart&index=an&req=20374532&lang=en
.
SSL Tunable Colour – Expt 1
Dimming control has
benefits;
What about novel SSL
features?
SSL Ex 1: Choices
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 0.8Veitch, Advanced Energy 2013 / slide 10
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
