Abstract: This invention relates to open or close top photobioreactor apparatus for improved productivity with a small footprint, that can be placed in varied temperature zones, above or below ground on land or in water or use in space-station for conducting aqueous aerobic or anaerobic; continues or batch wise cultivation and harvesting of photoautotrophic organism's. More particularly this invention concerns with a novel means and process for uniform optical dispersion and optical enhancement by utilizing a solar energy collection unit attached to a photo-emitting system which emits full spectrum or specific wavelength light substantially uniformly and radially along its length.