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LEDs for Indoor Scott Riesebosch Chief Technology Officer

LEDs for Indoor Scott Riesebosch Chief Technology Officer. CCT – what is it and why is it important for indoor lighting? And why the extra “C”? CRI – what is it and why is it important? Are LED replacement lamps really a contender? Some reliability data points to consider.

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LEDs for Indoor Scott Riesebosch Chief Technology Officer

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  1. LEDs for Indoor Scott Riesebosch Chief Technology Officer
  2. CCT – what is it and why is it important for indoor lighting? And why the extra “C”? CRI – what is it and why is it important? Are LED replacement lamps really a contender? Some reliability data points to consider
  3. Example blackbody radiators at various color temperatures. Colour Temperature (CT)‏ Colour temperature refers to shades of white light, and is measured on the Planck blackbody radiator scale (Black Body Locus, BBL)‏ This scale measures the colour of a blackbody radiator (an ideal device with perfect absorption and emission) at various Kelvin temperatures
  4. CorrelatedColor Temperature (CCT)‏ Not all “white” light lies directly on the BBL CCT refers to the Plankian black-body radiator colour temperature (CT) that is closest to the colour of the white light source Relationship between CCT & CT Examples of CCTs
  5. Correlated Colour Temperature Effects
  6. Color Rendering Index (CRI)‏ CRI is an objective standard used to judge how well a light source renders colours compared to a black-body radiator or daylight Incandescent bulbs are – by definition – equal to 100 Eight pastel colours are measured under the test light source CRI measures how much these colours are affected by the light source Note: LEDs have fully saturated colour and actually pay a mathematical penalty on the CRI system. Other standards for communicating colour are under investigation …
  7. Light Source CRI Low pressure sodium < 18 High pressure sodium 25 Warm white fluorescent tube 55 Typical Cool White LED 70-80 Daylight fluorescent tube 79 Metal halide 75-85 Typical Warm White LED 75-90+ Halogen MR16 95-100 Incandescent 100 CRI of common light sources
  8. LED replacement lamp performance “Although there were a few exceptions, most of the lamps had color quality attributes that were appropriate for replacing halogen PAR lamps in most applications” “All of the LED PAR38 lamps tested offer substantial energy savings compared to halogen PAR38 lamps, and some are more efficacious than compact fluorescent or ceramic metal halide versions” “It is reasonable to conclude that LED PAR38 lamps are (at least in terms of performance) a viable option in most installations where PAR38 lamps are used” Source: USDOE Caliper Program Summary Report 20 November 2012
  9. LED replacement lamp performance “Many of the Series 16 products would be an effective energy-saving alternative to incandescent BR30 or R30 lamps. Further, the efficacy and color characteristics are similar to or better than directional CFL lamps” “Adding other factors such as dimmability and longer rated lifetime makes LED BR30/R30 lamps the best solution for replacing inefficient and soon-to-be regulated incandescent BR30 and R30 lamps” Source: USDOE Caliper Program Summary Report 16 July 2012
  10. LED replacement lamp ROI Can be under one year in applications of high usage, and under 2 years in many applications Well suited to applications where maintenance cost is high Generally warranty is considerably longer than ROI Cost of ownership is a slam dunk in most applications
  11. How much does it cost to change a light bulb?
  12. Reliability – can they hold up? Plenty of reliability data now available Advances in material science and deeper understanding of failure modes that affect long term lumen maintenance and colour shift over time Energy Star program requires 6,000 hours of testing at elevated temperatures LED MR16 test lamps running continuously since August 2008
  13. Reliability – can they hold up?
  14. Reliability – can they hold up?
  15. Reliability – can they hold up?
  16. Reliability – can they hold up?
  17. Reliability – can they hold up? Over 44,000 hours later…
  18. Thank you
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