Hi Coilers, In my never ending search for info a came across 'Sam's Laser FAQ' at <http://www.misty-dot-com/people/don/laserhsc.htm>www.misty-dot-com/people/don/lase rhsc.htm This is really an amazing BIG site, with lot's of info about HVA Power Supply's and properties of arcing. Enjoy! Ruud de Graaf