Hi Carol and welcome to the wonderful world of poly clay (PC). Sorry, I don't know much about halogen ovens because most folks I know use convection ovens for PC, but Gilladian has given you good info.
Just in case it interests you I have a generic post here at PCC that I love to share with new PC-ers that lists my hints, best beginner book, curing info, sites to get beginning info etc. Here is a link to the most recent time it was posted. It’s gotten so long that I’ve split it into two posts. So please check out both of my consecutive posts.
p.1 is basic PC info
p.2 is a list of URLs to PC resources including tutorials
Anita in AZ