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LED tube for lighting, can be easily bend in ring form ... It can be attached to the lens (cmp. photo) or - more interesting - it can be used as some sort of darkfield illumination, on level with or behind the object. I did some test shots with my pocket knife. Nicer Viewing: "Results":http://bighugelabs.com/onblack.php?id=6468626369&size=large "Setup":http://fotopraxis.files.wordpress.com/2011/12/led-light-02.jpg "Ringlight attached to the lens":http://fotopraxis.files.wordpress.com/2011/12/img_7790-be.jpg