Infrared imaging of LED lighting tubes and fluorescent tubes

Sami Siikanen, Sini Kivi, Timo Kauppinen, Mikko Juuti

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

The low energy efficiency of conventional light sources is mainly caused by generation of waste heat. We used infrared (IR) imaging in order to monitor the heating of both LED tube luminaires and ordinary T8 fluorescent tubes. The IR images showed clearly how the surface temperatures of the fluorescent tube ends quickly rose up to about +50...+70°C, whereas the highest surface temperatures seen on the LED tubes were only about +30...+40°C. The IR images demonstrated how the heat produced by the individual LED chips can be efficiently guided to the supporting structure in order to keep the LED emitters cool and hence maintain efficient operation. The consumed electrical power and produced illuminance were also recorded during 24 hour measurements. In order to assess the total luminous efficacy of the luminaires, separate luminous flux measurements were made in a large integrating sphere. The currently available LED tubes showed efficacies of up to 88 lm/W, whereas a standard "cool white" T8 fluorescent tube produced ca. 75 lm/W. Both lamp types gave ca. 110 - 130 lx right below the ceiling-mounted luminaire, but the LED tubes consume only 40 - 55% of the electric power compared to fluorescent tubes.
Original languageEnglish
Title of host publicationThermosense: Thermal Infrared Applications XXXIII
EditorsSafai Morteza
PublisherInternational Society for Optics and Photonics SPIE
Number of pages11
ISBN (Print)978-0-8194-8587-8
DOIs
Publication statusPublished - 2011
MoE publication typeA4 Article in a conference publication
EventSPIE Defense, Security, and Sensing. Thermal Infrared Applications XXXIII. SPIE Defense, Security, and Sensing, - Orlando, FL, United States
Duration: 26 Apr 201128 Apr 2011

Publication series

SeriesProceedings of SPIE
Volume8013

Conference

ConferenceSPIE Defense, Security, and Sensing. Thermal Infrared Applications XXXIII. SPIE Defense, Security, and Sensing,
CountryUnited States
CityOrlando, FL
Period26/04/1128/04/11

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  • Cite this

    Siikanen, S., Kivi, S., Kauppinen, T., & Juuti, M. (2011). Infrared imaging of LED lighting tubes and fluorescent tubes. In S. Morteza (Ed.), Thermosense: Thermal Infrared Applications XXXIII [80130J] International Society for Optics and Photonics SPIE. Proceedings of SPIE, Vol.. 8013 https://doi.org/10.1117/12.883369