Patent ID: 7472430

Claim:
An apparatus for injecting light into a stream of water, the apparatus comprising: a nozzle having an inlet, a converging in section, a throat and an outlet, water injected into the inlet exiting the outlet in a stream, the inlet having a cross-sectional area greater than the outlet, the outlet having a cross-sectional area greater than or equal to the cross-sectional area of the throat; a light channel having a first and second end, the first end being in the water at the inlet of the nozzle; and a light emitter shaft made of a light transmitting material having a first and second end, located in the converging section of the nozzle between the inlet and outlet with the first end pointing at the first end of the light channel, and the second end pointing at the outlet of the nozzle, the light emitter being located a distance from the light channel.