Abstract: A light apparatus, which produces a central motionless light beam and at least one light beam rotating around the central beam, includes a cylindrical housing, a parabolic reflector, a lamp having a light sours in reflector's focus and a rotating non-transparent disk having a central round opening and at least one non-central opening. The disk is placed in front of the lamp with the reflector. The disk rotates without use of an electromotor. For rotation, the disk is mounted in an inner mobile metallic, for example aluminum, ring of ball-bearing, wherein balls, separators and an outer fixed ring are electric insulators. The diameter of the disk is preferably close to the diameter of the inner ring and to the diameter of the reflector. The inner ring is rotated by a rotating magnetic field. The disk rotates together with the inner ring. The rotating magnetic field is created by an inductor-stator, when the inductor-stator is supplied by polyphase alternating electric current.

Abstract: Device for mixing of colored lights includes a rotating disk having circular sectors of color filters. The disk rotates without use of an electromotor. In order the disk to rotate, the disk is mounted in an inner mobile metallic, for example aluminum, ring of a ball-bearing, wherein balls, separators and an outer fixed ring are electric insulators. The diameter of the disk is close to the diameter of the inner ring. The disk rotates together with the inner ring, which is rotated by a rotating magnetic field. The field is created by an inductor-stator, when the inductor-stator is supplied by polyphase alternating electrical current. When the disk rotates and one side of the disk is illuminated by a white light, while a motionless white screen is placed in front of the other side of the disk, a circle with rotating color sectors appears on the screen.

Abstract: A light apparatus, which produces a central motionless light beam and at least one light beam rotating around the central beam, includes a cylindrical housing, a parabolic reflector, a lamp having a light sours in reflector's focus and a rotating non-transparent disk having a central round opening and at least one noncentral opening. The disk is placed in front of the lamp with the reflector. The disk rotates without use of an electromotor. For rotation, the disk is mounted in an inner mobile metallic, for example aluminum, ring of ball-bearing, wherein balls, separators and an outer fixed ring are electric insulators. The diameter of the disk is preferably close to the diameter of the inner ring and to the diameter of the reflector. The inner ring is rotated by a rotating magnetic field. The disk rotates together with the inner ring. The rotating magnetic field is created by an inductor-stator, when the inductor-stator is supplied by polyphase alternating electric current.