Presentation given at the EUROLED conference in February 2013

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The lighting designer's view on where LED lighting should be going, at a conference attended by LED fixture manufacturers.

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Presentation given at the EUROLED conference in February 2013

  1. 1. A Lighting Designers view on LED Technology
  2. 2. In the beginning was the FLAME …
  3. 3. which came at quite a price …
  4. 4. It began simply enough
  5. 5. gained a solid reputation
  6. 6. threatened a species
  7. 7. became draught- proofed
  8. 8. achieved a brighter future
  9. 9. got turned upside- down in the
  10. 10. But it was still just a flame in a bulb
  11. 11. And then there was the lightning …
  12. 12. The long light had arrived
  13. 13. With all kinds of results
  14. 14. and scale
  15. 15. and story- telling
  16. 16. Until energy started costing more than was comfortable
  17. 17. Meanwhile, there were new frontiers …
  18. 18. The point source had been a dream
  19. 19. Because designers wanted CONTRO L
  20. 20. and once that idea took hold …
  21. 21. it took on enormous influence …
  22. 22. … for good or ill
  23. 23. Until …
  24. 24. and this …
  25. 25. became this …
  26. 26. Bulb s: Reflector (light) (heat) LEDs: 90°-140° viewing angle (light) (heat) (light) The fundamental differences: – Directionality of generated light • Omni-directional vs. directional – Means of evacuating generated heat • Convection vs. conduction
  27. 27. LED technology introduced us to a whole new way of looking at our old familiar friends …
  28. 28. But which also introduced us to a whole new world of lighting opportunities …
  29. 29. So … what DO we want from the LED?
  30. 30. Much of what the lighting designer wants is consistency across all of the available sources …. But can the LED deliver on
  31. 31. Much of what the lighting designer wants is consistency across all of the available sources …. But can the LED deliver on Energy efficiency ?
  32. 32. Much of what the lighting designer wants is consistency across all of the available sources …. But can the LED deliver on Energy efficiency ? Long life expectancy ?
  33. 33. Much of what the lighting designer wants is consistency across all of the available sources …. But can the LED deliver on Energy efficiency ? Long life expectancy ? Colour quality ?
  34. 34. Much of what the lighting designer wants is consistency across all of the available sources …. But can the LED deliver on Energy efficiency ? Long life expectancy ? Colour quality ? Cost effectiveness ?
  35. 35. Much of what the lighting designer wants is consistency across all of the available sources …. But can the LED deliver on Energy efficiency ? Long life expectancy ? Colour quality ? Cost effectiveness ? Light delivery ?
  36. 36. The benchmark for energy efficiency is provided by Building Regulations: Part L. Energy efficiency
  37. 37. Energy efficiency
  38. 38. LED technology comes at a price. There is a commercial balance that has to be achieved re. cost v. life to justify energy savings. Long life expectancy
  39. 39. Long life expectancy
  40. 40. Long life expectancy
  41. 41. LED light quality is varied – much of it poor. The commercial market for LEDs is enormous and the most profitable fixtures are the ones that can be bought cheap and sold dear. Poor colour is a major factor in that cheapness. Colour quality
  42. 42. Colour quality Sunlight Spectral Power Distribution (~100 numbers) CIE 1931 Chromaticity (xy or HSB) (2-3 numbers) Black Body Curve Color Temperature (1 number)
  43. 43. Colour quality David MacAdam – a scientist at Kodak – performed the first basic research in the late 1940’s Found a JND (Just Noticeable Difference) in color varied statistically by observer, size, and orientation in CIE 1931
  44. 44. Colour quality • CIE 1931 diagram, focused on the 3000K point. • Data points represent color points of approximately 1000 XSM 3080-01 modules, manufactured in January 2009. All units produced are shown. • All modules are within 3 MacAdam Ellipses • 99% of the modules are within 2 MacAdam Ellipses
  45. 45. Cost effectiveness is more than energy efficacy. The cost of an LED fixture supports the overall performance of its Longevity and its Colour Quality. Cost effectiveness
  46. 46. Cost effectiveness Ø Halogen, 3khrs life and 16 replacements Ø CFL / CMH, 12khrs life and 4 replacements Ø LED, 50khrs life and 1 replacement Cumulative maintenance required over 50khrs
  47. 47. How good a light beam does the LED produce? This performance factor is often ignored. typical tungsten halogen a good LED Light delivery
  48. 48. Light delivery •By using different phosphor mixes CRIs of 80+ or 95+ are available •80 + modules have a 20% higher efficacy •90+ modules have industry best colour-rendering properties, including vivid red portrayal (R9>90)
  49. 49. Light delivery
  50. 50. Light delivery Ra R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 Standard XSM 81 80 85 89 81 78 80 86 66 16 64 79 58 81 93 75 Artist Series XSM 98 98 99 98 98 98 97 98 98 96 99 98 88 98 98 98 Typical IR coated Halogen Dichroic 98 98 99 99 99 98 98 99 97 92 97 98 97 98 99 97 Typical Compact Metal Halide 82 90 94 69 82 81 81 87 71 27 59 62 55 93 78 88 Typical Compact Fluorescent 87 91 93 86 91 89 90 88 70 17 76 91 81 93 92 81
  51. 51. Light delivery Ra R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 Standard 81 80 85 89 81 78 80 86 66 16 64 79 58 81 93 75 Artist 98 98 99 98 98 98 97 98 98 98 99 98 88 98 98 98
  52. 52. The answer is certainly YES the LED can deliver on all these issues … Energy efficiency Long life expectancy Colour quality Cost effectiveness Light delivery
  53. 53. But not every LED …….. Sorry.
  54. 54. Thank you for your time

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