The housing can be of any shape such as tubular, bowl...http://www.google.ca/patents/US20040156199?utm_source=gb-gplus-sharePatent US20040156199 - LED lighting apparatusAdvanced Patent SearchPublication numberUS20040156199 A1Publication typeApplicationApplication numberUS 10/668,905Publication date12 Aug 2004Filing date23 Sep 2003Priority date23 Sep 2002Also published asUS7114834, US7759876, US200