Irradiance attachment for an optical fiber to provide a uniform level of illumination across a plane

A method of applying photodynamic therapy to a target situs which comprises:

• a) providing light delivery device, said light delivery device including:
• a hollow sperical shell which defines an outer sperical surface and a sperical cavity therein, and which includes a diffusive reflective inner surface,
• an input aperture formed within said hollow sperical shell for passing a beam of light into said cavity,
• a diffusive reflective surface within said cavity which is supported away from the inner surface of said hollow spherical shell and aligned with said input aperture, whereby light which passes through said input aperture into said cavity is reflected off said diffusive reflective surface before reaching the diffusive reflective inner surface of said spherical shell,
• an output aperture formed within said hollow spherical shell through which only light that is reflected off said diffusive reflective inner surface exits said hollow spherical shell, and
• a handle which is capable of being detached from said outer spherical surface of said hollow spherical shell at a position which covers said input aperture;
• b) positioning said output aperture of said light delivery device near a target situs;
• and
• c) delivering light into said light delivery device and therethrough to said target situs.