FSL operates as a manufacturing plant producing LED lamps, luminaires, and various lighting equipment, which are exported to over 110 countries worldwide. Annual sales attributed specifically to the FSL brand exceed THB 25 billion. The products comply with numerous international standards, including EMC, RoHS, CE, UL, and TIS (Thai Industrial Standard).

With over 60 years of experience, FSL has progressively advanced its production capabilities, evolving from manufacturing incandescent bulbs to utilizing modern LED technology. The company implements rigorous quality control measures and ensures its products can efficiently withstand voltage drops and surges.