It seems that not many people have.Listen to them.They actually give you "directions" to the clear light.Listen to Assault and Battery,and then The Golden Void.
Or Brainstorm for the description of a bad trips,or Orgone Accumulator for a description of a REALLY good trip.Or The Right Stuff,or Ejection(by Robert Calvert,a former member of Hawkwind),which is all about "ejecting" out of your body.They're the best.