The housing can be of any shape such as tubular, bowl...http://www.google.com/patents/US20040156199?utm_source=gb-gplus-sharePatent US20040156199 - LED lighting apparatusAdvanced Patent SearchPublication numberUS20040156199 A1Publication typeApplicationApplication numberUS 10/668,905Publication dateAug 12, 2004Filing dateSep 23, 2003Priority dateSep 23, 2002Also published asUS7114834, US7759876, U