Dam-Hansen, Carsten

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Downloaded from orbit.dtu.dk on: Dec 21, 2017Properties of LED – considering museum lightingDam-Hansen, CarstenPublication date:2015Document VersionPeer reviewed versionLink back to DTU OrbitCitation (APA):Dam-Hansen, C. (2015). Properties of LED – considering museum lighting [Sound/Visual production (digital)].”Properties of LEDs – considering museum lighting” 6-11-2014Carsten Dam-Hansen, DTU Fotonik,  cadh@fotonik.dtu.dk 1Properties of LED – considering museum lightingCarsten Dam-Hansen, DTU FotonikContents6-11-2014 Samlingsforum Carsten Dam-Hansen, DTU FotonikSolid State Lighting (SSL) i.e. LED based lighting is a “new” lighting technology that may offer many advantages for museum lighting.• Light  - Ultraviolet / Visible / Infrared• Energy efficiency of LED packages and SSL products• Light quality in color temperature and color rendering • Maintenance of luminous flux and color• Test and characterisation”Properties of LEDs – considering museum lighting” 6-11-2014Carsten Dam-Hansen, DTU Fotonik,  cadh@fotonik.dtu.dk 2Spectral properties of light6-11-2014 Samlingsforum                                                                                                         Carsten Dam-Hansen, DTU FotonikLight (visible light) is electromagnetic radiation in the visible rangeIn museum lighting we need to consider also UV and IR lightPhotometry specifies the perceived brightness of light taking the human eye sensitivity into consideration (standard observer)Radiometry specifies the radiant power in Watts (in a specific spectral range)IR radiation6-11-2014 Samlingsforum                                                                                                         Carsten Dam-Hansen, DTU FotonikInfrared radiation, wavelenghts > 780 nmwill cause heat and related humidity variationsMay cause surface hardening, discolouration and crackingRosenborg treasury, display case illumination5 W bulbs130-150 W∆T : 9-12 deg.Custom LED25-32 W∆T : < 1 deg.”Properties of LEDs – considering museum lighting” 6-11-2014Carsten Dam-Hansen, DTU Fotonik,  cadh@fotonik.dtu.dk 3UV radiationuseful to state the amount of UV per visible flux produced, in terms of microwatts per lumen (μW/lm)But UV LEDs and UV based white LEDs CIE 157:2004Light Source UV Content (μW/lm)Daylight 400 – 1500Tungsten Incandescent 70 – 80Tungsten halogen (incl. UV stop lamps)40 – 170Fluorescent 30 – 100Metal halide 160 – 700LEDs < 56-11-2014 Samlingsforum                                                                                                         Carsten Dam-Hansen, DTU FotonikLED packages, flux and efficiencies6-11-2014 Samlingsforum                                                                                                         Carsten Dam-Hansen, DTU FotonikLED packages(10-80 W, 1500-6000 lm)(~ 1-5 W, -1000 lm)3 mmEfficiency:123 lm @ 350 mA ~ 117 lm/WColor temperature2700 - 3500 K > 5000 K160 lm @ 350 mA ~ 152 lm/W (@ 25 °C)139 lm @ 350 mA ~ 132 lm/W (@ 85 °C)Lab results 2014: 303 lm/W”Properties of LEDs – considering museum lighting” 6-11-2014Carsten Dam-Hansen, DTU Fotonik,  cadh@fotonik.dtu.dk 4Status, SSL products6-11-2014 Samlingsforum                                                                                                         Carsten Dam-Hansen, DTU FotonikSSL products are based on LED packagesincluding optics, heat sinks and driver electronicsRetrofit products50-100 lm/W ~ 90-110 lm/W LED luminairesLED modules(no cap) LED lamps(cap) Colorimetry6-11-2014 Samlingsforum                                                                                                         Carsten Dam-Hansen, DTU FotonikIs used to describe the color of perceived lightColor sensitivity of the standard observerChromaticitydiagram(x,y)”Properties of LEDs – considering museum lighting” 6-11-2014Carsten Dam-Hansen, DTU Fotonik,  cadh@fotonik.dtu.dk 5Color temperature6-11-2014 Samlingsforum                                                                                                         Carsten Dam-Hansen, DTU Fotonik3000 KGreenishReddishDifferent light sourcesCCT is not enoughDuv is needed2200 KColor rendering6-11-2014 Samlingsforum                                                                                                         Carsten Dam-Hansen, DTU FotonikDifferent spectral power distributions has the sameCCT~3000K, CRI = 68.6 95.484.7but very different color rendering:CRILum. Eff.”Properties of LEDs – considering museum lighting” 6-11-2014Carsten Dam-Hansen, DTU Fotonik,  cadh@fotonik.dtu.dk 6Luminous flux maintenance6-11-2014 Samlingsforum                                                                                                         Carsten Dam-Hansen, DTU FotonikL70(6k) = 7500 hEstablished IES standard for LED packages: LM-80 and TM-21New IES standards for LED lamps: LM-84-14 and TM-28-14Need for accelerated test methods, with on/off cyclingLEDs doesn’t fail suddenly, but degrades slowly –Long term measurements of lumen maintenace of 48 retrofit LED lamps over 20.000 hColor maintenance6-11-2014 Samlingsforum                                                                                                         Carsten Dam-Hansen, DTU FotonikCorrelated color temperature as a function of time:To be publishedTo be published”Properties of LEDs – considering museum lighting” 6-11-2014Carsten Dam-Hansen, DTU Fotonik,  cadh@fotonik.dtu.dk 7Color maintenance6-11-2014 Samlingsforum                                                                                                         Carsten Dam-Hansen, DTU FotonikColor change even if CCT is constant, chromaticity coordinates as a function of time:To be publishedTest and characterisation6-11-2014 Samlingsforum                                                                                                         Carsten Dam-Hansen, DTU FotonikThere is a need for characterisation of SSL products • Spectral power distribution, UV,Vis (and IR)• Luminous flux• Efficiency• Correlated Color temperature, Duv• Color rendering index• Luminous flux and color maintenance• Relative damage factor• Intensity distribution and color• Illuminace, irradiance• Double monochromator• Handheld spectrometer”Properties of LEDs – considering museum lighting” 6-11-2014Carsten Dam-Hansen, DTU Fotonik,  cadh@fotonik.dtu.dk 8Test and characterisation6-11-2014 Samlingsforum                                                                                                         Carsten Dam-Hansen, DTU FotonikDraft international test standard has been published:CIE DIS 025/E:2014  Test Method for LED Lamps, LED Luminaires and LED ModulesEN 13032 Lighting Applications - Measurement and presentation of photometric data of lamps and luminaires - Part 4: LED  lamps, modules and luminairestested through an interlaboratorycomparison IC2013 by the IEA SSL Annex2010-2014 + 2014-2019110 laboratories Conclusion6-11-2014 Samlingsforum                                                                                                         Carsten Dam-Hansen, DTU FotonikThank you to all my coworkers at the LED team at DTU Fotonik, and for your kind attentionSolid State Lighting (SSL) i.e. LED based lighting is a “new” lighting technology that offers• Limited UV and IR radiation• High energy efficiency• High light quality in color temperature and color rendering• Long life time• Color tunability• Dimming, sensor based system to reduce exposure• Need to test and characterise

Properties of LED – considering museum lighting

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Properties of LED – considering museum lighting

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