Lamps and lighting equipment

Claim 1

A LAMP TO PROVIDE AN OUTDOOR LIGHT FOR DEMARCATION, GUIDING, SIGNALLING AND LIKE PURPOSES, SAID LAMP COMPRISING A COOPERATIVE ASSEMBLY OF A LIGHT-SOURCE AND A LENSPROJECTION SYSTEM FOR PROJECTING A BEAM OF LIGHT WHICH IS SUBSTANTIALLY PARALLEL-SIDED IN THAT IT HAS NO DIVERGENCE GREATER THAN THREE DEGREES AND IS SUBSTANTIALLY FREE FROM STRAY LIGHT OUTSIDE THE BEAM, SAID LENS-PROJECTION SYSTEM BEING REFLECTORLESS IN THE SENSE THAT IT INCLUDES NO REFLECTOR ELEMENT WHICH ACTUALLY TAKES PART IN THE PRODUCTION OF THE BEAM AS DISTINCT FROM MERELY CHANGING THE DIRECTION OF THE BEAM AS A WHOLE, THE PROJECTION SYSTEM INCLUDING AN OPTICAL STOP INTERPOSED BETWEEN THE ACTUAL LIGHT-SOURCE AND OTHER OPTICAL ELEMENTS OF THE PROJECTION SYSTEM WHEREBY THE APERTURE OF THE OPTICAL STOP BECOMES THE APPARENT LIGHT-SOURCE, AND THE PROJECTION SYSTEM FURTHER INCLUDING LENS MEANS OF FOCAL LENGTH NOT LESS THAN FIFTY TIMES GREATER THAN THE DIMENSION ACROSS THE APERTURE OF THE OPTICAL STOP, AND A POWER DRIVE FOR RAPIDLY AND CYCLICALLY MOVING AT LEAST ONE ELEMENT OF SAID ASSEMBLY THEREBY SHIFTING THE BEAM ANGULARLY WITH A RAPIDLY-REPEATED PATTERN OF MOTION SUCH THAT A SUBSTANTIALLY UNIDIRECTIONAL BEAM OF GREATER APPARENT DIVERGENCE AND GREAT VISUAL RANGE IS CREATED.