Light system useful for activating light-activated materials are disclosed. Various configurations of light emitting semiconductor chips and heat sinks are disclosed, as well as various structures and methods for driving, controlling and using them, and materials and structures usable therewith....http://www.google.com/patents/US6953340?utm_source=gb-gplus-sharePatent US6953340 - Light for use in activating light-activated materials, the light having a detachable light module containing a heat sink and a semiconductor chip
