Srisuwan, Khomkrit, and Rak Skulphong. “Effect of Power Factor on Combination of Fluorescent with LED Tubes”. Journal of Advanced Development in Engineering and Science 8, no. 22 (August 28, 2023): 45–52. accessed February 21, 2026. https://ph03.tci-thaijo.org/index.php/pitjournal/article/view/901.