I realize this is an effort to save money, but trying to reinvent the wheel (strobe) is a lot of effort. If you want strobes and cheap ones, go to hide away strobes for police and fire. They are cheap, 12 volt and light weight. Problem solved!
**************Play online games for FREE at Games.com! All of your favorites, no registration required and great graphics ? check it out! (http://pr.atwola.com/promoclk/100000075x1211202682x1200689022/aol?redir= http://www.games.com?ncid=emlcntusgame00000001)