Apparatus for illuminating comprises one or more fibers, the one or more fibers including fiber portions meeting at an apex and a bottom location to form a three dimensional cage； a detector attached to each of the fiber portions for receiving light and transmitting light along each of the fiber portions, respectively； and an illumination member situated within the cage. A method for illuminating a hollow member includes the steps of inserting one or more fibers into the hollow member, wherein one or more fibers include fiber portions that meet at a location to form a three-dimensional cage； permitting light to emit from within the three-dimensional cage and towards the fiber portions； receiving light at distinct locations on each of said fibers； and allowing each of the fibers to transmit the light received on each of the fiber portions out of the hollow member.
