TY - JOUR N2 - This article is focused on considerations based on experimental studies concerning changes of selected parameters of identical compact fluorescent lamps (CFLs) intended for use in buildings during their operation. The studies constituted a long-term experiment whose goal was an evaluation of selected operating parameters of the CFLs in terms of meeting the requirements set out in the specified regulations as well as the issue of marking the lamps with the energy efficiency class. The measurements were performed with the authors’ experimental setup consisting of original equipment designed and made especially for the purpose of the measurements. The studies covered registration of the luminous flux as well as selected electrical parameters such as active power, current and the power factor during the so-called “start-up time” and operation time equal to 100 h, 500 h, 1000 h, 2000 h, etc. with a 1000 h step. The studies were finished with the moment of natural burnout of the CFLs tested. The results showed that the biggest drawback of CFLs is lack of preservation of the required time to reach 60% of the stabilized luminous flux just after short time of lamp operation. Similarly when assessing the conformity of the parameters declared by the manufacturer that have been verified, it can be stated that they are true only at the initial stage of lamp operation. L1 - http://journals.pan.pl/Content/116020/PDF/art07.pdf L2 - http://journals.pan.pl/Content/116020 PY - 2020 IS - No 3 EP - 472 DO - 10.24425/mms.2020.132782 KW - lighting technology KW - compact fluorescent lamp KW - energy efficiency KW - light source KW - luminous flux A1 - Zygarlicki, Jarosław A1 - Zygarlicka, Małgorzata A1 - Mroczka, Janusz PB - Polish Academy of Sciences Committee on Metrology and Scientific Instrumentation VL - vol. 27 DA - 2020.10.12 T1 - Fast four-point estimators of sinusoidal signal parameters – numerical optimisations for embedded measuring systems SP - 465 UR - http://journals.pan.pl/dlibra/publication/edition/116020 T2 - Metrology and Measurement Systems ER -