Maximizing LED Technology
MEPC LED Workshop
Leah Hiniker, Hennepin County
February 10, 2015
Advantages to LEDs
• Long lasting – expected to last 50,000+ hours
• No UV rays
• Warranty of 3 to 5 years or 10 years now
• Instant on
• Fully dimmable – great for daylighting
• Multiple colors
• Love cold – will last longer in colder conditions
• No mercury or lead – dispose of in garbage
• Cleaner more directional light
• Shock and vibration resistant
• Cooler to operate
• Efficiency
Disadvantages
• Upfront Cost
• Temperature dependency
• Voltage sensitivity
• Color shift
• Non-uniformity
What to watch for with LEDs
• Long standing company – GE, Cree, Philips, Sylvania
• Warranty – 3 to 5 years minimum
• Test it - does it fit? good quality light?
• Energy Star rating, UL listing, DOE testing, IES testing,
DesignLights Consortium
• Warm locations > 120 º F
• Dimmers not always compatible
Choosing LED Fixtures and Lamps
Not all fixtures or lamps are the same:
• Initial lumens vs delivered lumens
• More lumen output does not equate to brighter light where you need it
• Photometric evaluation
https://www.visual-3d.com/
Light Quality
Lower the number the better typically.
Light Distribution Types
Horizontal Pattern
Vertical Pattern
LED Wall Pack Analysis
LED Controls Options
Daylighting – full dimming
Occupancy/vacancy sensor – instant on/off
Switch dimming – user controlled
High and low end trim – maximize energy efficiency
Adjust-end trim to maintain lumens
LED Controls Options
Daylighting – full dimming
Occupancy/vacancy sensor – instant on/off
Switch dimming – user controlled
High and low end trim – maximize energy efficiency
Color temperature – becoming more available
Types of Dimming Control
Types of Dimming Control
Dimming Load
Dimmers have maximum and minimum loads for LED’s
• Over loading can cause failure
• Under loading can cause the lights to not work or not dim
Calculating Energy Savings
• Energy savings:
• Does it reduce your demand?
• Average cost per demand - $0.10 per kwh
• Average cost w/o demand - $0.065 per kwh
• Occupancy savings:
• What percentage of the time is the space occupied?
• High end trim energy savings:
• Operational and maintenance savings:
• Lamp replacement cost
• Lift cost
• Utility Rebates:
• Prescriptive vs custom
• CEE One Stop Program
LED Retrofit Example
MH Lamp = 8,000 Lumens
Example Calculation:
Existing: 150w MH Parking Garage
New: 50w LED occupancy sensor
Current Energy Use: 170w/1000*52*7*24 = 1485 kWh
$148.5 annually
Current Energy Cost: 1485 kWh*$0.10=
New Energy Use: 50w/1000*52*7*24=
New Energy Cost: 436 kWh * $0.10=
436 kWh
$43.6 annually
Energy cost savings = $104.9
New fixture cost installed: $330 plus $150 install = $480 total
Xcel Rebate: $135+$30 = $165
Simple Payback: 4.6 years
One Stop Rebate: $185
3.0 years
http://www.xcelenergy.com/staticfiles/xe/Marketing/Files/NM-Bus-LightingInput-Wattage-Guide.pdf
Example Calculation:
Existing: 150w MH Parking Garage
New: 50w LED occupancy sensor
High end trim savings: 5w/1000*52*7*24*$0.10 = $4.37 annually
Occupancy sensors: 35w/1000*52*(5*12+2*24)*$0.065 = $12.78 annually
Total Energy Savings: $122 annually per fixture
Payback = 2.6 years
Example Calculation:
Operational Savings:
Lamp life: MH - 15,000 Hours (1.7 years) LED – 50,000 Hours (5.7 years)
Lamp cost: $35 each for MH
Lamp change out 3 times = $105
Labor costs? Equipment cost?
Annual lamp change out cost = $18.42
Energy + O&M cost savings = $140 annually
Payback of 2.3 years
Purchasing Considerations
• Bulk order – the more you buy the cheaper then are
• Order directly – cut mark-up and sales tax ~ 17% savings
• State contracts – need to request this from vendor
• Multiple bids – get three bids on same product
• Know the model number – make sure you are getting what you want
• Order preset – have the factory set the adjustments not electricians
• Utilize your vendors – have them count fixtures in your facilities
• Pre-approval – make sure your project qualifies for a rebate
• Trial fixture – install a test fixture
• Design – run photometrics to make sure you have the correct light level
Hennepin County Examples
In 2014 Hennepin County:
• Spent $500,000 on lighting projects
• Obtained $36,000 in rebates for lighting projects
• Saved $50,000 in electricity costs
A19 at Hosmer Library
A19 at Park Cafe
PAR30 at HCGC Gallery
PAR38 at Central Library Gallery
PAR38 at North Regional Library
LED at HCGC Elevators
And the elevator buttons
LED at JJC Elevators
MR16 at Eden Prairie Library
LED Can Lights at HSB
LED Canopy Lights at JJC/JDC
Before
Parking Garage Ramp at Central Library
After
Parking Garage Ramp at Central Library
MR16 at Southdale Library
MR16 at Southdale Library
Old Wall Pack
LED Wall Pack
Wall Packs Hopkins Library
Canopy Lights Maple Plain Library
PSL Pole Lights
PSL Pole Light Retrofit
6th Street LED Retrofit
LED Retrofit Kits Maple Plain Library
Before
After
Before
After
Know what is needed to make adjustments
Questions?
Leah Hiniker, Energy Manager
Hennepin County
612.543.1219 or leah.hiniker@hennepin.us