Sun tracking light distributor system

A sun-tracking light distributor system for use in an open-ended photo-bioreactor having an aqueous liquid for a photosynthetic culture, comprising:

• at least one light distributor adapted to be at least partly immersed in said aqueous liquid in use, each light distributor comprising a body made of a transparent material allowing sunlight rays to pass therethrough, each light distributor including
• a concentrator supporting section with a light entry surface adapted to receive sunlight rays, said light entry surface being at an enlarged end of said concentrator supporting section, said light entry surface being provided above a surface of said aqueous liquid;
• an elongated rod section with a light distribution surface adapted to redirect the received sunlight rays within said aqueous liquid, said light distribution surface being along a sidewall of said elongated rod section, said light distribution surface being adapted to be at least partly immersed in said aqueous liquid in use, said elongated rod section being in optical communication with said concentrator supporting section to allow the received sunlight rays to travel within the body from the light entry surface to the light distribution surface;
• a light concentrating element provided at said light entry surface which concentrates within said elongated rod at least a portion of said sunlight rays received at said light entry surface;
• a displacement system operatively connected to said at least one light distributor and adapted to change an orientation of the light entry surface of said at least one light distributor to track a solar position with respect to at least one axis.