what is color shift for a luminaire? for our discussion, “color shift” is what happens over time...
TRANSCRIPT
![Page 1: What is color shift for a luminaire? For our discussion, “color shift” is what happens over TIME It does NOT mean initial variation in color from one](https://reader035.vdocuments.net/reader035/viewer/2022062421/56649d9f5503460f94a8ab0d/html5/thumbnails/1.jpg)
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What is color shift for a luminaire?
• For our discussion, “color shift” is what happens over TIME
• It does NOT mean initial variation in color from one luminaire to another or from one batch to another
Orange
Green
Blue
Pink
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What are some of the causes for color shift in luminaires?
• Aging (for example, UV exposure may cause plastics to change color)
• Operating conditions (contaminants in the atmosphere may cause luminaire changes)
• Light engines may shift color over time (different engines shift color differently)
• Maintenance issues may cause the luminaires to look different over time (“wrong” parts installed)
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Nearly all light engines havesome type of “color shift”
• Metal Halide lamps are notorious for color shift
• Incandescent bulbs color shift when dimmed
• Linear Fluorescents may not color shift “much” however, improper maintenance practices can cause obvious luminaire color shift over time
• LEDs use a technology that will shift color over time
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Why does color shift with LED-based luminaires need attention?
• The causes of color shift with LEDs are not well understood or communicated
• Caliper testing shows color shift with LED-based luminaires is real and can be so great as to constitute a “failure” to an end user
• This creates a potential for trouble
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Our group identified four challenges
• Describing color shift
• Projecting color shift
• Identifying design impact on color shift
• Testing for color shift
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Describing color shift• How can we make description of color shift consumer “friendly”?
Too Hard Too Simple
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Projecting color shift• Our group could not identify any team that is trying use that
data to project color shift over an extended period of time (50,000 or more hours)
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Identifying designimpact on color shift
• Remember, the color shift in the final luminaire may be not be due to an LED color shift
• Examples include:– Different optics and designs age differently– Different environmental operating conditions may cause
different shifts over time– Different luminaire designs impact color– The luminaire may or may use active color
management
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Testing for color shift
• Testing is not a one-size fits all situation
– LED-bulbs that replace A-lamps may be suited to one type of color shift testing
– Low-volume, decorative LED-based luminaires for lobbies and board rooms may need another type of testing
– Outdoor LED-luminaires may need different testing methods than ones in air-conditioned spaces
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What did the group suggestthat we do next?
• Attack the issue by focusing on three segments:– Replacement lamps– Specification-grade luminaires– Standard-grade luminaires
• Try to get segment-specific working groups to organize and start work
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Summary with respect to Color shift for LED-based luminaires:
• It is important
• It is complex
• It needs more work
• It can be segmented to facilitate action
• It may be up to us to keep it going
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Thanks for your attention
• Terry ClarkCEO, Finelite, Inc.
• On behalf of the:– Solid-State Lighting Product Quality Initiative– Next Generation Lighting Industry Alliance with
the U.S. Department of Energy