Calcium rides light beams.  Can penetrate oceans to 600 feet.  Comet’s tail pointing away proves light has weight.  Economical at $1,000,000/pound.  Escapes suns only with aid of X rays.  Explosive when confined at high temperatures. 
Not a basic energy of space.  Same thing as heat, electricity, magnetism, chemism, energy, and matter.  Science can never say what it actually is.  Sometimes modified by energy and matter in space.  Straight-line movement in space.  Subject to gravity of material mass, circular-gravity presence of Paradise.  Succession of energy particles, not waves; moves in straight lines through space.  Suns convert energy almost wholly into.  White light. 
Adjusters are true light that lights every man.  Apostles were light of world.  Jesus was light of world.  Let one’s light shine with wisdom and discretion.  Light can blind and confuse; should not attract attention to self.  Material Sons saturated with.  Music created by control of.  Not honestly lived up to becomes darkness.  Paradise worlds of Son directionize light to superuniverses.  Personality manifestation of spirit beings.  Primary eruption upon personalization of a local universe Mother Spirit.  Sermon on light of world.  Spirit luminosity accompanies Adjusters.  Spiritual luminosity of Father’s personal presence.  Threefold fluctuation of Deity abode.  Threefold light of Paradise and Havona.  Types are intellectual insight, spirit luminosity. 
See also: UB 0:6.8-9.