Lumen maintenance: Difference between revisions
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Added additional information to the LM-80 section including more recent releases (LM-80-08, LM-80-15) and as much information that is known about the upcoming update (rumored to include laser diodes, but not confirmed). Replaced broken link w/new source. |
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* Manually verifying lighting levels in a space by using [[photometer]]s in specific locations, and then manually setting the system to meet lighting requirements.<ref>{{cite web|url=http://ateam.lbl.gov/Design-Guide/DGHtm/lumenmaintenance.htm|title=Lumen maintenance|website=ATeam.LBL.gov|accessdate=28 May 2015}}</ref> |
* Manually verifying lighting levels in a space by using [[photometer]]s in specific locations, and then manually setting the system to meet lighting requirements.<ref>{{cite web|url=http://ateam.lbl.gov/Design-Guide/DGHtm/lumenmaintenance.htm|title=Lumen maintenance|website=ATeam.LBL.gov|accessdate=28 May 2015}}</ref> |
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== IESNA LM-80 == |
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IESNA LM-80 is the Department of Energy (DOE) approved testing method for measuring lumen depreciation of solid-state (LED) light sources, arrays and modules.<ref>{{cite web|url=http://www.eetimes.com/document.asp?doc_id=1280235|title=Understanding LM-80 to evaluate LEDs|last=|first=|date=|website=EE Times|archive-url=|archive-date=|dead-url=|accessdate=22 August 2017}}</ref> The Illumination Engineering Society of North America (IESNA) and the Department of Energy Solid State Lighting Standards Development group worked together to create the LM-80 test criteria. The [https://www.vektrex.com/solutions/lm-80-test-solutions/ IESNA LM-80 committee is chaired by Jeff Hulett], CTO at [https://www.vektrex.com/ Vektrex Electronic Systems Inc.], who continues to work with the group to update and improve the LM-80 standard. |
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Following the release of the original LM-80 standard, the LM-80 working group released two additional updates: LM-80-08 and LM-80-15. LM-80-15 expanded the standard to include radiant, photon or luminous flux maintenance.<ref name=":0">{{Cite news|url=https://www.vektrex.com/solutions/lm-80-test-solutions/|title=LM-80 Test Solutions - Vektrex|work=Vektrex|access-date=2017-08-22|language=en-US}}</ref> Currently, Jeff Hulett and the IESNA LM-80 working group are developing another update to LM-80.<ref name=":0" /> No release date has been announced for this update. |
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==== Jeff Hulett, CTO at Vektrex Electronic Systems Inc. ==== |
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Jeff Hulett is the Founder and CTO of Vektrex Electronic Systems, Inc. Because of his vision and leadership, the company grew from a start-up to the market leader. Currently, Hulett is the Chief Architect for Vektrex products placing the highest emphasis on technology and quality. Hulett holds a BSEE from the Illinois Institute of Electronics, and has been awarded four U.S.patents. He is a member of the Illumination Engineering Society of North America (IESNA), and chairs the IESNA LM-80 working group that is focused on LED flux maintenance testing. He has been active in the LED testing and reliability field since 2004.<ref>{{Cite news|url=https://www.vektrex.com/news-articles/webinar-lm-80-standards-update/|title=Overview of LM-80 Standards Update - Vektrex|date=2015-07-21|work=Vektrex|access-date=2017-08-22|language=en-US}}</ref> |
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== References == |
== References == |
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Revision as of 16:52, 22 August 2017
In LED lighting, lumen maintenance is the luminous flux remaining (expressed as a percentage of the initial output) at any selected elapsed operating time. Lumen depreciation is the luminous flux lost over time, and thus the complement of lumen maintenance.[1]
Lumen maintenance compares the amount of light produced from a light source or from a luminaire when it is brand new to the amount of light output at a specific time in the future. For instance, if a luminaire produced 1,000 lumens of light when it was brand new and now produces 700 lumens of light after 30,000 hours, then it would have lumen maintenance of 70% at 30,000 hours.[2] Useful lifetime estimates for LED lighting products are typically given in terms of the expected operating hours until light output has diminished to 70% of initial levels (denoted L70 life).[3]
There are a number of methods for controlling lumen maintenance areas:
- Installing photoreceptors tied directly to ballasts, controlling the voltage output to the lamps based on the set level of luminance.
- Connecting dimming ballasts directly to an energy management system that has been programmed for the expected depreciation of the lamps; the energy management system directs the output of ballasts as necessary to maintain required lighting levels over time.
- Manually verifying lighting levels in a space by using photometers in specific locations, and then manually setting the system to meet lighting requirements.[4]
IESNA LM-80
IESNA LM-80 is the Department of Energy (DOE) approved testing method for measuring lumen depreciation of solid-state (LED) light sources, arrays and modules.[5] The Illumination Engineering Society of North America (IESNA) and the Department of Energy Solid State Lighting Standards Development group worked together to create the LM-80 test criteria. The IESNA LM-80 committee is chaired by Jeff Hulett, CTO at Vektrex Electronic Systems Inc., who continues to work with the group to update and improve the LM-80 standard.
Following the release of the original LM-80 standard, the LM-80 working group released two additional updates: LM-80-08 and LM-80-15. LM-80-15 expanded the standard to include radiant, photon or luminous flux maintenance.[6] Currently, Jeff Hulett and the IESNA LM-80 working group are developing another update to LM-80.[6] No release date has been announced for this update.
Jeff Hulett, CTO at Vektrex Electronic Systems Inc.
Jeff Hulett is the Founder and CTO of Vektrex Electronic Systems, Inc. Because of his vision and leadership, the company grew from a start-up to the market leader. Currently, Hulett is the Chief Architect for Vektrex products placing the highest emphasis on technology and quality. Hulett holds a BSEE from the Illinois Institute of Electronics, and has been awarded four U.S.patents. He is a member of the Illumination Engineering Society of North America (IESNA), and chairs the IESNA LM-80 working group that is focused on LED flux maintenance testing. He has been active in the LED testing and reliability field since 2004.[7]
References
- ^ "Cree Xlamp Long-Term Lumen Maintenance" (PDF). Cree.com. Cree Inc. Retrieved 24 July 2013.
- ^ "LED Reliability and Lumen Maintenance". Retrieved 24 July 2013.
- ^ "Guide to Evaluating LED Lumen Maintenance" (PDF). Retrieved 24 July 2013.
- ^ "Lumen maintenance". ATeam.LBL.gov. Retrieved 28 May 2015.
- ^ "Understanding LM-80 to evaluate LEDs". EE Times. Retrieved 22 August 2017.
{{cite web}}: Cite has empty unknown parameter:|dead-url=(help) - ^ a b "LM-80 Test Solutions - Vektrex". Vektrex. Retrieved 2017-08-22.
- ^ "Overview of LM-80 Standards Update - Vektrex". Vektrex. 2015-07-21. Retrieved 2017-08-22.