The secondary light is separated from the received beam of light.

The branch lumen is in fluid communication with the trunk lumen through the anastomosis.

By providing an optical structure redirecting the secondary light away from the primary light source, absorption of the secondary light by the primary light source can be substantially reduced or eliminated.

In response, the light converter emits secondary light of one or more wavelengths different than the primary wavelength, and the output light includes a combination of the primary light and the secondary light.

The first dopant emits the secondary light at the second wavelength and the second dopant emits the secondary light at the third wavelength.

Mixed light is generated by mixing non- converted primary light and the secondary light.

In one configuration, the introducer assembly has a first delivery lumen and a secondary lumen.

The housing includes a light exit (124) for outputting a combination of primary light (140) and secondary light (156,158).

The endoscope sheath may also include an elongate secondary tube defining a secondary lumen.

The system may include an optional secondary light concentrator.

The system may include an optional secondary light concentrator.

The phosphor-converting element generates the secondary light at the third wavelength in response to excitation by the primary light and/or the secondary light at the second wavelength.

The combination of the secondary light and the primary light passing though the beads may form white light.

Return light related to the sub-beam is received by a sub-light receiving means (311) and return light related to the main beam is received by a main light receiving means (312).

The invention relates to a primary light converter (1) for converting primary light (3) into secondary light (4).