A semiconductor radiation source has a base body on which at least two LED chips are directly mounted and are fitted to the base body using a thermally conductive connection. At least one printed circuit board is mounted on the base body and extends from the centrally arranged LED chips to the outside,...http://www.google.se/patents/US20070228392?utm_source=gb-gplus-sharePatent US20070228392 - Semiconductor radiation source and light curing device
