I've been successfully night riding for the last two winters with just a 5w smart halogen with a lead/acid battery strapped my top tube.
I added a Cateye Neko headlight to my helmet for this years Clic 24. I've just got a Hope Vision 2 and the Tesco torch, all I need to do is attach the torch now.
1st ride out will be tomorrow night, we'll see how I get on.