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Summary

LED Task Lighting

Task Lighting: LED vs. Incandescent

Plug-in LED luminaires used to supplement ambient light at workstations

Synopsis:

Workers feel and perform better in a properly lit workplace.  By raising, lowering, and tilting an adjustable-arm task light, the user can vary how much light is provided, and select the best angle  to avoid direct glare and reflections (Hogrebe, 2015).  A variety of LED task light products are now available that allows workers to personalize their workspace while providing uniform light distribution and elimination of dark corners. Task lights are used to place light where it is needed and reduce the use of overhead (ambient) lighting systems. The use of task lights is increasing as ambient lighting in offices is reduced (often code-mandated).  

Many task lights use halogen bulbs, which are considerably less efficient than LED technology. Although fluorescent task lights have a similar efficiency as LEDs, the much smaller size of LEDs allows fixtures to be very small and sleek, saving space and providing a modern look. LED task lamps with ENERGY STAR® or LED Lighting Facts® labels usually have an input power between 3 and 14 Watts and are available in a variety of styles and color temperatures. Some LED products offer dimming capability, adjustable color temperature and integral occupancy sensors. Alternatively, LED task lamps can be plugged into an intelligent power strip that has an occupancy sensor or a programmable intelligent outlet.

Energy savings are most likely to occur when an LED task lighting system is integrated with an overhead lighting system---but these energy savings are diminishing as overhead lighting becomes more efficient and subject to occupancy sensor and daylighting controls.  The first cost of LED task lamps can be higher than desk lamps using compact fluorescent or halogen technology. This may be a market barrier for commercial and home offices on a tight budget. However, the cost of LED lighting products is decreasing steadily and is expected to continue to do so. 

Energy Savings: 85%
Energy Savings Rating: Limited Assessment  What's this?
LevelStatusDescription
1Concept not validatedClaims of energy savings may not be credible due to lack of documentation or validation by unbiased experts.
2Concept validated:An unbiased expert has validated efficiency concepts through technical review and calculations based on engineering principles.
3Limited assessmentAn unbiased expert has measured technology characteristics and factors of energy use through one or more tests in typical applications with a clear baseline.
4Extensive assessmentAdditional testing in relevant applications and environments has increased knowledge of performance across a broad range of products, applications, and system conditions.
5Comprehensive analysisResults of lab and field tests have been used to develop methods for reliable prediction of performance across the range of intended applications.
6Approved measureProtocols for technology application are established and approved.
Simple Payback, New Construction (years): 0.0   What's this?
Simple Payback, Retrofit (years): 2.4   What's this?

Simple Payback is one tool used to estimate the cost-effectiveness of a proposed investment, such as the investment in an energy efficient technology. Simple payback indicates how many years it will take for the initial investment to "pay itself back." The basic formula for calculating a simple payback is:

Simple Payback = Incremental First Cost / Annual Savings

The Incremental Cost is determined by subtracting the Baseline First Cost from the Measure First Cost.

For New Construction, the Baseline First Cost is the cost to purchase the standard practice technology. The Measure First Cost is the cost of the alternative, more energy efficienct technology. Installation costs are not included, as it is assumed that installation costs are approximately the same for the Baseline and the Emerging Technology.

For Retrofit scenarios, the Baseline First Cost is $0, since the baseline scenario is to leave the existing equipment in place. The Emerging Technology First Cost is the Measure First Cost plus Installation Cost (the cost of the replacement technology, plus the labor cost to install it). Retrofit scenarios generally have a higher First Cost and longer Simple Paybacks than New Construction scenarios.

Simple Paybacks are called "simple" because they do not include details such as the time value of money or inflation, and often do not include operations and maintenance (O&M) costs or end-of-life disposal costs. However, they can still provide a powerful tool for a quick assessment of a proposed measure. These paybacks are rough estimates based upon best available data, and should be treated with caution. For major financial decisions, it is suggested that a full Lifecycle Cost Analysis be performed which includes the unique details of your situation.

The energy savings estimates are based upon an electric rate of $.09/kWh, and are calculated by comparing the range of estimated energy savings to the baseline energy use. For most technologies, this results in "Typical," "Fast" and "Slow" payback estimates, corresponding with the "Typical," "High" and "Low" estimates of energy savings, respectively.

Status:

Details

LED Task Lighting

Task Lighting: LED vs. Incandescent

Plug-in LED luminaires used to supplement ambient light at workstations
Item ID: 3
Sector: Residential, Commercial
Energy System: Lighting--Fixtures: Indoor
Technical Advisory Group: 2009 Lighting TAG (#1)

Synopsis:

Workers feel and perform better in a properly lit workplace.  By raising, lowering, and tilting an adjustable-arm task light, the user can vary how much light is provided, and select the best angle  to avoid direct glare and reflections (Hogrebe, 2015).  A variety of LED task light products are now available that allows workers to personalize their workspace while providing uniform light distribution and elimination of dark corners. Task lights are used to place light where it is needed and reduce the use of overhead (ambient) lighting systems. The use of task lights is increasing as ambient lighting in offices is reduced (often code-mandated).  

Many task lights use halogen bulbs, which are considerably less efficient than LED technology. Although fluorescent task lights have a similar efficiency as LEDs, the much smaller size of LEDs allows fixtures to be very small and sleek, saving space and providing a modern look. LED task lamps with ENERGY STAR® or LED Lighting Facts® labels usually have an input power between 3 and 14 Watts and are available in a variety of styles and color temperatures. Some LED products offer dimming capability, adjustable color temperature and integral occupancy sensors. Alternatively, LED task lamps can be plugged into an intelligent power strip that has an occupancy sensor or a programmable intelligent outlet.

Energy savings are most likely to occur when an LED task lighting system is integrated with an overhead lighting system---but these energy savings are diminishing as overhead lighting becomes more efficient and subject to occupancy sensor and daylighting controls.  The first cost of LED task lamps can be higher than desk lamps using compact fluorescent or halogen technology. This may be a market barrier for commercial and home offices on a tight budget. However, the cost of LED lighting products is decreasing steadily and is expected to continue to do so. 

Baseline Example:

Baseline Description: 60W Incandescent/halogen task light
Baseline Energy Use: 222 kWh per year per unit

Comments:

Baseline energy use for office application calculated assuming 60 W incandescent/halogen lamp and 10.1 hr/day (3687 hr/yr) of operation. (Navigant, 2012)

Manufacturer's Energy Savings Claims: Currently no data available.
Best Estimate of Energy Savings:

"Typical" Savings: 85%
Energy Savings Reliability: 3 - Limited Assessment

Comments:

As of early 2014, an LED lamp, on a lumen-for-lumen replacement, saves between 80% and 90% of the energy compared to an incandescent lamp with the same output.

Energy Use of Emerging Technology:
33.3 kWh per unit per year What's this?

Energy Use of an Emerging Technology is based upon the following algorithm.

Baseline Energy Use - (Baseline Energy Use * Best Estimate of Energy Savings (either Typical savings OR the high range of savings.))

Comments:

The U.S. DOE estimates for office lighting operation are 10.1 hr, day (3687 hr/yr) of operation. (Navigant, 2012)

Technical Potential:
Units: unit
Potential number of units replaced by this technology: 94,380
Comments:

Based on Navigant's 2010 Market Characterization for U.S. DOE SSL Program (Navigant, 2012), the U.S. office square footage is 14,300,000,000 and there are 33 lamps/1000 sf.  Using the author’s estimate of 0.5% desk lamps, the total U.S. office desk lamps is 2,359,000. This report contains national data. Since the Northwest is about 4% of the population of the U.S., we take about 4% of the national number.

Technical Potential = 4% * 2,359,000 = 94,380 units

Technical Potential = 194,350 units * 188 kWh/yr/unit = 18 million kWh/yr = 0.02 TWh/yr

Regional Technical Potential:
0.02 TWh per year
2 aMW
What's this?

Regional Technical Potential of an Emerging Technology is calculated as follows:

Baseline Energy Use * Estimate of Energy Savings (either Typical savings OR the high range of savings) * Technical Potential (potential number of units replaced by the Emerging Technology)

First Cost:

Installed first cost per: unit
Emerging Technology Unit Cost (Equipment Only): $40.00
Emerging Technology Installation Cost (Labor, Disposal, Etc.): $0.00
Baseline Technology Unit Cost (Equipment Only): $40.00

Comments:

Lamp costs vary considerably with style, and thus an LED task light may be less expensive than a more stylish incandescent or CFL task light.  As of September, 2014, Amazon.com has LED task lights from $10 to $126, and they had incandescent task lights from $18 to $302.  In general, the incandescent lamps were more expensive with fewer choices.  For purposes of assessing cost effectiveness, an average cost of $40 for both lamp types was assumed.

Cost Effectiveness:

Simple payback, new construction (years): 0.0

Simple payback, retrofit (years): 2.4

What's this?

Cost Effectiveness is calculated using baseline energy use, best estimate of typical energy savings, and first cost. It does not account for factors such as impacts on O&M costs (which could be significant if product life is greatly extended) or savings of non-electric fuels such as natural gas. Actual overall cost effectiveness could be significantly different based on these other factors.

Reference and Citations:

CEC, 07/11/2013. Case Study: Integrated Office Lighting System (IOLS)
California Energy Commission, PIER

US DOE, 2013. LED Lighting Facts Products
U.S. Department of Energy

Terry Clark, 10/07/2009. Breakthrough in Office Lighting For Today’s Changing Offices
Finelite, Inc.

Stan Walerczyk, 11/30/2012. WEBCAST: Tunable lighting - Changing color and light levels to enhance our enjoyment and wellbeing
LEDs Magazine

Navigant, 01/01/2012. 2010 U.S. Lighting Market Characterization
U.S. Department of Energy Building Technologies Program

Mark Hogrebe, 02/18/2015. Putting Light Where It's Needed: The Benefits of Task Lighting
National Association of Independent Lighting Distributors News

Energy Star, 2010. ENERGY STAR® Eligible Residential Fixture Types
Energy Star

Energy Star, 07/01/2013. ENERGY STAR Qualified Lamps Product List
Energy Star

Rank & Scores

LED Task Lighting

2009 Lighting TAG (#1)


Technical Advisory Group: 2009 Lighting TAG (#1)
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