Dear PBS friends, Ellen's question can also be answered from the Wiki pages that have TOW (Topic of the Week) summaries of past discussions. Mary Sue has provided TOW pages at: http://pacificbulbsociety.org/pbswiki/index.php/… There are also links for TOW 2003 and TOW 2004 on that page. You can also use Google to search PBS archives for possible answers. For example searching PBS archives for "changing hemispheres" gets you to: http://pacificbulbsociety.org/pbslist/old.php/… This is not quite the same, but may also be useful: Bulbs that can be converted to another cycle- TOW at: http://pacificbulbsociety.org/pbslist/old.php/… Bob Rutemoeller brutem@mcn.org