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Hasibi, R. A. A., A. Jamal, I. Surahmat, T. Hardiyanto, Y. Jusman, and F. Arkan. “Comparative Analysis of the Use of LED and HPS Lights in PT. Bukit Asam”. Journal of Electrical Technology UMY, vol. 3, no. 3, Sept. 2019, pp. 83-88, doi:10.18196/jet.3358.