Kudos on the lighting discussion, Martin.  It makes me more interested 
     in investigating VHO ballasts.  My 4' tubes have too short a life and 
     flicker far too much for my own comfort.
     I've seen pretty high numbers when it comes to efficient VHO ballasts, 
     but I think I could afford to drop $100ish if I could find a 
     worthwhile one.  Any recommendations and or important things to avoid 
     in looking for a new ballast?