@IWT... No expert here but I have a ash twig and recently picked up one of the 'cheap' small vvps from ebay/amazon that's been talked about on the reg-non-reg power supply thread. It's pretty cool and bumps up the heat a bit. This may help you out. I also picked up another wall plug from radio shack that allows you to switch voltage from 9v-10.2v, 12v, and 13v. About $20. This has been working great for me. I keep it at 9v when not in use and switch it to 13v right before I want to use it. Than pack a stem or get the glass ready and its good to go. If I'm using wax or oils I'll keep it on 13 otherwise I'll move it to 12. It's nice 'cause its not a bright light and plugs right into the UD. No mod necessary. It's a bit smaller than the original wall plug that Dave gives too.