Task / Vertical / Ambient
Layers of Light
Jerry Mix: CEO, Finelite, Inc.
Task / Ambient Lighting Research
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PIER Research – Energy Savings
Site
% Task
Energy
Savings
% Ambient
Energy
Savings
% Energy
Savings
Total/
Reduced
w/ft2
Lifecycle
Savings per
Cubicle
DMH
86%
32%
49%
0.74 w/ft2
$895
DMV
84%
20%
28%
1.31 w/ft2
$1,229
GexPro
66%
58%
59%
0.56 w/ft2
$948
Average
79%
35%
45%
$1,024
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PIER Research – Occupant Satisfaction
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Key Research Findings
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Reduced energy usage by
28‐59% for office space
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Poor quality task
lighting is costly
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Achievable lower lighting
power density ranging
between 0.50 and 0.65 w/f2
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The LED‐task / low ambient
lighting outcome results in
tremendously improved user
satisfaction
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The LED‐task / low ambient
strategy is cost effective
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The quality and energy efficiency
of office lighting is directly related
to the quality and energy
efficiency of the task lighting
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Ziggurat Building Research Paper
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Large Office Ziggurat Building Site Report
(Emerging Technologies Program of PG&E)
Findings:
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Low Ambient / Task Lighting reduced ambient light level
from 37 FC to 17.5 FC average.
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Peak Load reduced from 1.26 to .59 w/f2
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Improved Occupant Satisfaction with the new lighting.
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Key Results Summary
Task Low Ambient Delivers:
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Proper task illumination levels
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Improved user satisfaction
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50% reduction in energy
consumption
•
Reduction in installed and
operating costs
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Impact of Contrast
The following examples show how the decrease in retinal illuminance causes a
decrease in the ability of the viewer to see contrast between text and
background.
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Understanding the Criteria
Use the Following Criteria to
Properly Light Vertical Services
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Define the architecture through
vertical brightness
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Use fixture energy effectively
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Average 20fc on a 50%
reflective surface
LPD
~ 0.04 w/ft2
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Understanding the Criteria
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30fc maintained ambient
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Uniformity 3:1 max to min in
immediate work area
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Lighting Power Density = 0.4 w/ft2
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Use the right amount of fixtures
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Reduce ambient fixture quantity
LPD
0.4 w/ft2
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Key Methodology
LPD
~ 0.04 w/ft2
Light the Task
LPD
~ 0.04
Light the
Vertical Surfaces
w/ft2
LPD
~ 0.4 w/ft2
Ambient Lighting
Power Density
can be Reduced
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Task + Vertical + Ambient
Illuminance (fc)
35
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70
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Meets Targets
Luminance Uniformity Ratios
Around Seating Area = 2.6:1
Across Broad Viewing Areas = 1.5:1
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Campus Wide Adoption of Task/Low Ambient Approach
View all LD+A magazine articles on www.finelite.com/media-center.html
National Grid
Double LEED
Platinum Rating
SHI
Office space designed to
use only 0.50 w/ft2
NREL
Greenest Office
Building in the U.S.
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National Grid
Efficiency Strategies for Lighting
Include:
• Pendant luminaires with 1T8 lamp
on 16’ centers
• 6 watt LED task lamps
- Task Low Ambient Approach
- Massive energy savings
- 44% below ASHRAE 90.1
- Double LEED Platinum
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SHI International
Task / Low Ambient Approach
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•
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0.6 w/sf for Task, Vertical, and Ambient
1T8 lamp on 18’ spacing
Recessed and wall mounted vertical illumination
7.4w Dimmable LED Desk lamps
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National Renewable Energy Laboratory
Task / Low Ambient Approach
• Toward Net-Zero building
• T8 lamps on 16’ spacing
• 6w LED Desk lamps
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Lower Installed Costs
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Energy Savings
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Validate
• Good Design
• Best Practices
www.finelitetnze.com/validate.html
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For Quick Turnaround Tenant Improvement Projects
Recessed LED Wall Wash
High Performance
Fluorescent Luminaires
LED Task Lighting
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For Long Term Occupancy or Long Hours of Operation
Recessed LED Wall Wash
High Performance
LED Luminaires
LED Task Lighting
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Next Steps / Barriers to Faster Adoption
Hard Metrics – Driving to 0.5 watts per square foot
• Achieve 50% electricity savings
• IES light levels maintained
• Meet all current standards
• 100% user satisfaction
• Provide individual user control
• Lower installed costs are possible
• Reduce construction and
operating costs
• $0.30 per sf operating costs saved
annually
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Thank You for Your Attention
I am happy to take questions
or send them to me at
jerry.mix@finelite.com
Here are important sources:
IES - www.iesna.org
Finelite – www.finelite.com
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