Luminosity is an absolute measure of radiated electromagnetic power (light), the radiant power emitted by a light-emitting object. In astronomy, luminosity is the total amount of electromagnetic energy emitted per unit of time by a star, galaxy, or other astronomical object. It often is said that we know very little about UFOs but hundreds of reports have been receive of UFOs shining brightly greater than the moon and lighting up an entire area. The working hypothesis used in the following is 1) UFOs have an objective existence as solid objects which emit energy. UFOs as solid objects have a body and an area outside the body. This “sheath” area is where many luminous effects exist. UFO luminosity is probably the result of energetic processes which may very well be technically generated. Triangular UFO launches huge beam of light over Florida on October 7, 2017.