The effects of flickering light stimulation have been known for a long time. Ancient shamans knew that flickering light could induce altered states of consciousness. Around 200 A.D. , Ptolemy noted that the flickering of sunlight seen through the spokes of a spinning wheel could cause patterns and colors to appear to the observer, and could produce a feeling of lightheadedness and euphoria. Experimentation in the 1960's and 70's showed that adding pulsing sound enhanced the experience. Some of the above was extracted from Megabrain, Michael Hutchison.
Intensity refers to the brightness of the light stimulation.
Just scale is a seldom used musical scale that has seven notes per octave, and is designed to make chords relative to the base of the octave come out right. Thus a better chord is produced. The integer pitches of the Just scale make integer binaural beat offsets work better. See also tempred scale. Light frames or Stimulation Glasses are eyeglass frames with light sources mounted inside in front of the eyes.