I don't work with flexwatt enough to give a good answer. But here is a Flexwatt FAQ that might give some info you need. http://www.reptilebasics.com/flexwatt-faq.html
If not I would contact Rich at ReptileBasics.com(http://www.reptilebasics.com/help.ph...us&mode=update). He wires up all my flexwatt projects. The guy is pretty handy with the stuff and might have the info you need.