energy efficient lighting
DESCRIPTION
Energy Efficient Lighting. Overview. Fundamentals Light Quantity Light Quality Glare Energy efficiency Lighting and Productivity Inside-out Approach to Energy Efficient Lighting End-Use Maximize daylighting Deliver required quantity of lighting Distribution - PowerPoint PPT PresentationTRANSCRIPT
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Energy Efficient Lighting
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Overview Fundamentals
– Light Quantity– Light Quality– Glare– Energy efficiency– Lighting and Productivity
Inside-out Approach to Energy Efficient Lighting– End-Use
• Maximize daylighting• Deliver required quantity of lighting
– Distribution• Position lights effectively• Improve luminaire efficiency
– Primary Energy Conversion• Install high-efficiency lighting
Quantifying Savings
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Light Quantity
Luminous flux– Quantity of visible light
output, lumens, lm.
Illuminance– Luminous flux divided
by area on which it is incident.
– 1 footcandle = 1 lm/ft2
Recommended illuminance increases as size and contrast of visual task decrease.
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Light Quality Our eyes evolved
to see in natural sunlight; thus, we distinguish colors best in sunlight.
Color Rendering
Index (CRI) describes the effect of a light source on the color appearance of an object.
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HPS and HBF Lights (Same Facility with Same Camera)
High Pressure Sodium High Bay Fluorescent Lights CRI = 22 CRI = 85
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Glare
Glare is very high contrast between lighting levels
Avoid glare with parabolic luminairs, light shelves, and reflective blinds.
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Energy Efficiency
Lighting efficiency = (lm/W)light x (CU)fixture/room
Efficient lighting:1. High lm/W 2. High CU
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Characteristics of Superior Lighting
Correct Quantity High Quality Minimum Glare Energy efficiency
Superior Lighting
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Superior Lighting Increases Productivity
Superior Lighting
Reno post office lighting retrofit.– Energy savings = $22,400 /year– Productivity improvement = $400,000 /year
Pennsylvania Power and Light– Energy savings = $2,000 per year– Sick leave decreased from 72 to 54 hours/year
Lockheed Martin office with daylighting– Energy savings = 4-year payback– Absenteeism dropping by 15%: 1-year payback
California schools – Test scores 20% higher in schools with daylighting
Chain of 100+ retail stores– Sales higher in stores with sky lights
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Inside-out Approach to Energy Efficient Lighting
– End-Use• Deliver required quantity of lighting• Maximize daylighting
– Distribution System• Position lights effectively• Improve luminaire efficiency
– Primary Equipment• Install high-efficiency lighting
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Utilize Existing Daylighting
Wright Brothers Factory, Dayton Ohio
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Utilize Existing Daylighting
Bureau of Engraving and Printing, Washington D.C.
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Utilize Existing Daylighting - By Turning Off Lights Near Windows -
Known• 10 465-W MH fixtures near
windows operating 6,000 hours/year
Action• Turn off 10 fixtures for 3,000
hours/yrSavings
• 10 fix x .465 kW/fix x 3,000 h/yr = 14,000 kWh/yr
• 14,000 kWh/yr x $0.10 /kWh = $1,400 /yr
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Restore Existing Daylighting- By Replacing Discolored Glass and Fiberglass
with Corrugated Polycarbonate and Double Pane Lexan -
CP costs same as FG, but 10x more light
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Install Skylights and Optimize Area Optimum skylight/floor area ratio
– Ranges from 1% to 6% – Increases with target lighting level– Decreases as lights are more efficient
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Reduce Excess Electric Lighting
Known• Measured = 50 fc• Required = 30 fc
Action• Disconnect (1- fcreq/fcmea) % of
fixturesSavings
• Disconnect= (1 – fcreq / fcmea) = (1 – 30 / 50) = 40% of fixtures
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Inside-out Approach to Energy Efficient Lighting
– End-Use• Deliver required quantity of lighting• Maximize daylighting
– Distribution System• Position lights effectively• Improve luminaire efficiency
– Primary Equipment• Install high-efficiency lighting
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Disconnect Blocked Lights
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Position Task Lighting Above Work Areas
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Reposition Lights Below Scaffolding
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Use Reflectors that Push Light Onto Workplane
Replace acrylic with aluminum MH reflectors Add reflectors to fluorescent strip lighting
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Paint Ceilings White
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Install Occupancy Sensors in Seldom Used Areas
Known• Occupancy sensors cost $15 -
$80 each• 10 237-W T12 fixtures
operating 6,000 hours/year Action
• Install occupancy sensors to turn off fixtures for 3,000 hours/yr
Savings• 10 fix x .237 kW/fix x 3,000
h/yr = 7,110 kWh/yr• 7,110 kWh/yr x $0.10 /kWh =
$711 /yr
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Install Photocells On Outdoor Lights
Known• Photocell switches cost about $15
each • 10 465-W MH fixtures operating
6,000 hours/year Action
• Install photocells which turn off fixtures for 3,000 hours/yr
Savings• 10 fix x .465 kW/fix x 3,000 h/yr
= 14,000 kWh/yr• 14,000 kWh/yr x $0.10 /kWh =
$1,400 /yr
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Turn off Lights in Unused Areas
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Inside-out Approach to Energy Efficient Lighting
– End-Use• Deliver required quantity of lighting• Maximize daylighting
– Distribution System• Position lights effectively• Improve luminaire efficiency
– Primary Equipment• Install high-efficiency lighting
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Replace Incandescent with Compact Fluorescent Lamps
CF lamps Use 75% less energy Last 8-10 times longer Result in less mercury emissions
Known• 100 100-W I lamps, life = 1,000 hours, cost = $1,
operating 6,000 h/yr Action
• Replace with 23-W CF lamps, life = 10,000 hours, cost = $5
Savings• 100 lamps x (.100 - .023) kW/lamp x 6,000 h/yr =
46,200 kWh/yr• 46,200 kWh/yr x $0.10 /kWh = $4,620 /yr • 100 lamps x 6,000 h/yr x ($1/1,000– $5/10,000) (h-
lamp)-1 = $300 /yr• $4,620 /yr + $300 /yr = $4,920 /yr
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Replace T12 Lamps & Electro-magnetic Ballastswith T8 Lamps & Electronic Ballasts
T8 XP lamps with LBF electronic ballasts: Use 42% less energy and put same
amount of light on workplane Improve CRI and eliminate flicker
Known• 100 fixtures with four 34-W T12 lamps and electro-magnetic ballasts operating
6,000 h/yr Action
• Replace with four 28-W XP T8 lamps and LBF electronic ballastsSavings
• 100 fix x (.144 - .084) kW/fix x 6,000 h/yr = 36,000 kWh/yr• 36,000 kWh/yr x $0.10 /kWh = $3,600 /yr
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Replace Metal Halide with High Bay Fluorescent Lights
High bay fluorescent (HBF) lights: Reduce energy use by 50% or more Improve CRI Reduce maintenance costs Stabilize light level Improve light distribution Can be turned on/off as needed, w/ occupancy or w/photocells
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Replace Metal Halide with High Bay Induction Lights
HBI uses 50% less energy than MH to produce same illuminance HBI has instant restrike compared to 15-minute for MH HBI CRI = 0.90 compared to CRI = 0.65 for MH HBI lasts 100,000 hours compared to 20,000 hours for MH HBI has reduced lumen degradation compared to MH (90%
compared to 70% halfway through rated life) HBI light output is insensitive to temperature
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Emerging Lighting Technologies: LEDs
Light emitting diodes (LEDs) currently used in: – Computer monitors and televisions– Exit signs, flashlights, etc.
Colored LEDs much more efficient than incandescent with colored filters. – California has replaced thousands of 150-W incandescent light bulbs that last
about 1 year in traffic lights with red, yellow and green LEDs that consume about 15 W and last about 5 years.
White LED efficiency currently between incandescent and T8 fluorescent lights, but:– Efficiency is increasing quickly, theoretical efficiency = 100%– Distribution efficiency ~ 100%– LEDs last about 5 times as long as incandescent lights.
LEDs are next lighting revolution
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Quantifying Savings
1. Calculate number of proposed lights needed to deliver required footcandles.
2. Calculate annual energy cost savings from replacing the current lights.
3. Calculate annual relamping cost savings, including labor and material costs.
4. Calculate total annual cost savings including energy and relamping savings.
5. Calculate the one-time implementation cost of replacing the current lights.
6. Calculate simple payback of the investment.
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Power Input Determined by Ballast – Not Lamp
Wattage on lamp is nominal value Power input determined by ballast power Example: 51-W Fluor F32T8 Low Output Electronic Ballast powering 2 x 32 W lamps.
– Power input including ballast = 51 W (not 2 x 32 W = 64 W) Example: 465-W MH ballast powering a 400-W MW lamp
– Power input including ballast = 465 W (not 1 x 400 W = 400 W)
Fluorescent Lamps Type Nominal
Power (W)
Rated Life (hr)
Mean Output
(lm)
CRI Cost ($)
4-ft T12 48-in T12 34-W 34 20,000 2,280 62 1.40 48-in T12 40-W 40 20,000 2,910 73 4.00 4-ft T8 48-in T8 32-W 32 20,000 2,710 78 1.90 48-in T8 32-W, long life, low merc 32 24,000 2,710 75 2.60 48-in T8 32-W, cover guard 32 20,000 2,625 78 11.00 8-ft T12 96-in T12 60-W 60 12,000 5,060 62 3.90 96-in T12 95-W 95 12,000 6,960 60 6.00 96-in T12 110-W 110 12,000 7,740 60 13.00 8-ft T8 96-in T8 59-W 59 15,000 5,310 75 7.80 96-in T8 59-W, cover guard 59 15,000 5,150 75 24.10 96-in T8 86-W 86 18,000 7,200 75 17.70
Fluorescent Ballasts Type Lamps Lamp
Power (W)
Ballast Power
(W)
Ballast Factor
Cost ($)
4-ft T12 Fluor F34T12 Electromagnetic 2 34 68 .87 4-ft T8 Fluor F32T8 Electronic (Low Output) 2 32 51 .75 $36 Fluor F32T8 Electronic (Normal Output) 2 32 58 .87 $15 Fluor F32T8 Electronic (High Output) 2 32 77 1.20 $36 8-ft T12 Fluor F96T12 Electromagnetic 2 60 112 .88 Fluor F96T12 Electromagnetic 2 95 203 .91 Fluor F96T12 Electromagnetic 2 110 237 .95 8-ft T8 Fluor F96T8 Electronic 2 59 110 .85 $25 Fluor F96T8 Electronic 2 86 160 .88 $29
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Luminosity Determined by Lamp and Ballast
Mean output of lamp is nominal value Light output = nominal lm/lamp x ballast factor Ballast factor for fluourescents: high output ~1.2; normal output ~0.87, low output ~0.75 Ballast factor for HIDs (MH, HPS)= 1.0 Example: Fluor F32T8 Low Output Electronic Ballast powering 2 x 32 W lamps.
– Light output = 2 x 2,710 lm x 0.75 = 4,065 lm Example: MH 400-W lamp with nominal output 23,500 lm
– Light output = 1 x 23,500 lm x 1.0 = 4,065 lm
Fluorescent Lamps Type Nominal
Power (W)
Rated Life (hr)
Mean Output
(lm)
CRI Cost ($)
4-ft T12 48-in T12 34-W 34 20,000 2,280 62 1.40 48-in T12 40-W 40 20,000 2,910 73 4.00 4-ft T8 48-in T8 32-W 32 20,000 2,710 78 1.90 48-in T8 32-W, long life, low merc 32 24,000 2,710 75 2.60 48-in T8 32-W, cover guard 32 20,000 2,625 78 11.00 8-ft T12 96-in T12 60-W 60 12,000 5,060 62 3.90 96-in T12 95-W 95 12,000 6,960 60 6.00 96-in T12 110-W 110 12,000 7,740 60 13.00 8-ft T8 96-in T8 59-W 59 15,000 5,310 75 7.80 96-in T8 59-W, cover guard 59 15,000 5,150 75 24.10 96-in T8 86-W 86 18,000 7,200 75 17.70
Fluorescent Ballasts Type Lamps Lamp
Power (W)
Ballast Power
(W)
Ballast Factor
Cost ($)
4-ft T12 Fluor F34T12 Electromagnetic 2 34 68 .87 4-ft T8 Fluor F32T8 Electronic (Low Output) 2 32 51 .75 $36 Fluor F32T8 Electronic (Normal Output) 2 32 58 .87 $15 Fluor F32T8 Electronic (High Output) 2 32 77 1.20 $36 8-ft T12 Fluor F96T12 Electromagnetic 2 60 112 .88 Fluor F96T12 Electromagnetic 2 95 203 .91 Fluor F96T12 Electromagnetic 2 110 237 .95 8-ft T8 Fluor F96T8 Electronic 2 59 110 .85 $25 Fluor F96T8 Electronic 2 86 160 .88 $29
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Coefficient of Utilization CU is fraction light emitted by lamps delivered to workplane CU is function of RCR, reflectance of walls, rw, and reflectance
of ceiling, rc, and the fixture RCR = 5 x h x (w + l) / (w x l) Reflectance:
CU values for 8-ft 4-lamp or 4-ft 2-lamp fluorescent fixture (www.goodmart.com)
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Determine Required Number of Lights
Illuminance on a workplane, Ew (fc) is
Ew (fc) = [LPF(lm/fix) x N(fix)] x CU / Aw(ft2)Thus,
N = (Ew x Aw) / (CU x LPF)
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Lamp Replacement Costs
The number of lamps that must be replaced each year, Nr, can be calculated as:
Nr = Num lamps x annual operating hours / lamp lifetime
Example: Calculate lamp replacement cost for 320 400-W MH fixtures if lights operate 8,000 hours per year. The cost of a 400-W MH lamp is about $23.The hourly wage for a skilled-trade electrician is $65 per hour, and it takes 30 minutes to replace a lamp.
Nr = 320 lamps x 8,000 hours/year / 20,000 hours = 128 lamps/yearCost = 128 lamps/year x ($23 /lamp + (30/60 hours/lamp x $65 /hour)) Cost = $7,104 /year
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Natural Lighting Design
Illuminance on a workplane, Ew (fc) is
Ew = (Esl x Asl) x tskylight x twell x CUroom / Aw
Where, Esl can be calculated from:
Esl = Ih (W/ft2) x 110 lm/W (luminous intensity of sunlight)
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Natural Lighting Design
LightSim Lighting Simulation Software: Uses TMY2, TMY3 or EPW
weather data Simulates illuminance on a
workplane, Ew (fc) Calculates number of hours and
fraction of time that natural lighting exceeds target illuminance.
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