Fireflies, members of the Lampyridae family in the order Coleoptera, are insects capable of bioluminescence. There are approximately 2,000 species worldwide, primarily found in tropical, subtropical, and temperate regions. Fireflies possess specialized light-emitting cells containing firefly luciferin and luciferase. Luciferase efficiently catalyzes a reaction involving luciferin, adenosine triphosphate (ATP), oxygen, and magnesium ions, converting biological energy into yellow-green fluorescence. This reaction is highly efficient, with 95% of the energy released in the form of light—far surpassing current human-made light sources like incandescent bulbs, which convert only about 10% of energy into light.