An Investigation of A19 LED Retrofit Lamps in The Turkish Market

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Köseoğlu C., Erdem Atılgan L.

PROCEEDINGS OF the 29th Quadrennial Session of the CIE, District-Of-Columbia, United States Of America, 16 - 19 June 2019, vol.1, pp.1348-1355

  • Publication Type: Conference Paper / Full Text
  • Volume: 1
  • Doi Number: 10.25039/x46.2019
  • City: District-Of-Columbia
  • Country: United States Of America
  • Page Numbers: pp.1348-1355
  • Istanbul Technical University Affiliated: Yes


The Turkish LED market receives from a significant number of different brands, providing the end user with similar retrofit lamps easily purchasable from different shopping channels. This variety in products results in a broad quality spectrum among LED light sources. This study aims at evaluating off the shelf A19 LED retrofit lamps in the Turkish market as of November 2018 through electrical, photometric, spectral and temporal measurements. In order to do this, 50 different A19 type E27 base LED retrofits have been analysed. The rated values of the LED retrofits have been compared to the values obtained through measurements and the results have been analysed according to the relative differences between the rated and measured results as well as values defined by European standards. The main objective of the study is to evaluate the properties of LED retrofits consumers frequently buy and utilize in their in terior lighting environments.