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LED in LUMINAIRES

LED in LUMINAIRES. Benefits of LED Luminaires . Energy savings – Up to and Exceeding 50% LED is environmentally clean / RoHS (International standard : Restrictions on Hazardous Substances) Improved security – All fixtures stay on Long life - 70,000 hrs and longer

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LED in LUMINAIRES

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  1. LED in LUMINAIRES

  2. Benefits of LED Luminaires • Energy savings – Up to and Exceeding 50% • LED is environmentally clean / RoHS (International standard : Restrictions on Hazardous Substances) • Improved security – All fixtures stay on • Long life - 70,000 hrs and longer • Potentially huge maintenance savings - re-lamp and ballast replacement up to $1000 each

  3. Operating Conditions • Metal Halide (MH) and High Pressure Sodium (HPS) require warm-up time and cool-down/warm-up after power failure vs. LED instant-on. • Fluorescent has poor efficiency in cold weather (chart) vs. LED efficiency improves with colder temperatures.

  4. Technical Information

  5. Tj Basic LED Construction

  6. Terms • Tj – Junction Temperature • Affects Lumen Output • Affects Life Rating • Affects Color Stability Over Lifetime • Downward Delivered Lumens • Lumens per Watt (L/W) • Lumen Maintenance (L70 @70K)

  7. Issues • Color Rendering (CRI) • HPS=22, MH=65 (typ. outdoor), LED=75, Inc=100 • Scotopic vs. Photopic Issue • Human Eye Response, ASSIST • Color Temperature • Affects LED Lumen Output • Many LED Fixtures Use 6000K as Standard LED Color (Yields Highest Ratings) • DOECALiPER Program • Commercially Available LED Product Evaluation and Reporting • Reference www.ssl.energy.gov/caliper.html

  8. 2100K CCT • 8460 Mean Lumens • (Equiv. to 100W • HPS) • 6500K CCT • 3300 Mean Lumens Mesopic Street Lighting Report Jan.31, 2008 see www.lrc.rpi.edu

  9. 5500 4500 3500 COLOR TEMPERATURE

  10. LED Integration

  11. Luminaire Considerations • Heat Dissipation • How is the LED heat moved out of the Luminaire? • Is the method reliable (heat rises, prone to plugging, etc.)? • Rated Life (L70), Output De-rate and Color Stability based on Thermal Design and Tj • What Kind of Light is Needed? • Color Temperature : 6000K (highest out but cold) vs. 4500K (close to MH) vs. 3500K (warm) • CRI based on LED selection • What Optic System is best? • Direct Delivery: higher efficiency, higher uniformity – visible source • Indirect Delivery: lower efficiency, dark spots, lower uniformity - hidden source • IESNA Types (II, III, IV, V) • Refractor optics (higher efficiency, more light control) vs. reflectors • Dark Skies / Light Pollution / BUG Ratings (replaced cut-off designations) • LED Considerations • Reputable, Quality Manufacturer? • LM-80 Data / Reports (IES Standard for Lumen Depreciation Reporting) • Reliable Circuit Design – Series-Parallel (constant light level) • Reliable LED Printed Circuit Board design and attachment (no clips or springs)

  12. More Considerations • Photometric Tests per LM-79 (IES Standard for SSL Photometry) • Requires Absolute Photometry in lieu of Relative Photometry • Independent Test Lab or in-house Lab (if available)? • LED Driver • Separate driver or included on LED Boards? • Driver placement in Luminaire (away from heat) • Drive Current (350mA vs. 700mA vs. ? mA) ties into Thermal Design • Reputable, Quality Manufacturer? • Warranty • Lightning / Electrical Surge Protection (IEC 6100-4-5 Standard) • Available Options • Hi – Low Operation or Dimming • Controls • Warranty • 50,000 to 100,000 hrs vs. 1 Year Warranty? • How Long has Fixture Manufacturer been in Business?

  13. Retrofit/Conversion

  14. Issues • How is Heat Dissipation Accomplished • Affects Lumen Output • Affects Life Rating • Affects Color Stability • Photometry and LM-79 (in the fixture) • Driver • Warranty

  15. Any questions?

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