What does ULR stand for?

MLA style: "ULR." Acronym Finder . 2013. AcronymFinder.com 21 May. 2013 <a href="http://www.acronymfinder.com/Upward-Light-Ratio-(luminaire-measurement)-(ULR).html">http://www.acronymfinder.com/Upward-Light-Ratio-(luminaire-measurement)-(ULR).html
Chicago style: Acronym Finder . S.v. "ULR." Retrieved May 21 2013 from <a href="http://www.acronymfinder.com/Upward-Light-Ratio-(luminaire-measurement)-(ULR).html">http://www.acronymfinder.com/Upward-Light-Ratio-(luminaire-measurement)-(ULR).html
APA style: ULR. (n.d.) Acronym Finder. (2013). Retrieved May 21 2013 from <a href="http://www.acronymfinder.com/Upward-Light-Ratio-(luminaire-measurement)-(ULR).html">http://www.acronymfinder.com/Upward-Light-Ratio-(luminaire-measurement)-(ULR).html

Upward Light Ratio (luminaire measurement)

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