Bioluminescence is the production of light by a living organism, with a variety of postulated functions. Dinoflagellates, also referred to as Pyrrophyta (fire plants), are famous for their circadian rhythm of bioluminescence, with 18 genera being reported so far to contain the enzyme luciferase and the substrate, sometimes luciferin binding protein LBP, generally considered to be compartmentalized in specialized organelles referred to as “scintillans”. The ongoing theory involved the mechanical stress activation of a G protein-coupled receptor through calcium signaling, followed by depolarizing vacuole membrane with an action potential. The function of bioluminescence, however, was postulated to be in redox dissipation or in ‘burglar’ alarm. We have alternatives and wish to explore.