NOVELTY - The method involves providing an organic glass panel having a top and a bottom surfaces. The micro-lens (207) is formed in the organic glass panel. The organic glass panel is attached to an inorganic glass substrate to form a micro-lens array (201). The inorganic glass substrate is provided with a material that is less transmissive to ultraviolet light. A light guide (204) is arranged below the micro-lens array, such that a gap (212) separates the light guide and the micro-lens array. The photovoltaic cells (205) are arranged adjacent to one edge of the light guide.    USE - Method for manufacturing light collecting device such as photovoltaic power generating window (all claimed). Can also be used in roof, skylight and facade.    ADVANTAGE - The light collector can be arranged, such that the inorganic glass substrate can be exposed to the exterior to prevent the portion of the ultraviolet radiation incident on the light collector from being transmitted to the organic glass panel. The building-integrated photovoltaic products can efficiently absorb light and generate energy, and can improve the transmission to illuminate the inside of the building. Thus, the manufacturing costs of the light collecting device can be reduced efficiently. Since the amount of light transmitted can be varied or controlled by varying or controlling the density or fill factor of the optical features. The light collectors including multi-cone light redirecting structures can efficiently collect light over the wide range of incident angles. The existing PV cells can be replaced periodically with newer and more efficient PV cells without having to replace the entire system. This ability to replace PV cells can reduce the cost of maintenance and can upgrade respectively.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a light collecting device.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view illustrating the implementation of light collector having micro-lens and multi-cone light redirecting structure that is provided as photovoltaic power generating window.    Micro-lens array (201)    Light guide (204)    Photovoltaic cells (205)    Micro-lenses (207)    Gap between micro- lens array and light guide (212)