Mine have a round flouresent bulb. The bulbs are a bit hard to find when you need one.
I bought my first one and then got the exact same one at a thrift store for $10, now I have two.
Halogen seems like it would take more skill than I have to use, concerned I wouldn't figure out the heat issue.
Not that I will but if I was going to get another on I would get a LED one.