The housing can be of any shape such as tubular, bowl...http://www.google.com/patents/US7759876?utm_source=gb-gplus-sharePatent US7759876 - LED lighting apparatusAdvanced Patent SearchPublication numberUS7759876 B2Publication typeGrantApplication numberUS 11/462,921Publication dateJul 20, 2010Filing dateAug 7, 2006Priority dateSep 23, 2002Fee statusLapsedAlso published asUS7114834, US20040156199,