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