Full sun is often described as 6 or more hours of sun, which I think would be fine for them.

If you don't have at least 6 hours, you might want to ask over on the Iris Forum. They really know their bearded irises over there.

Sue

It depends on the iris variety. But I have some plain blue-purple ones that only get AM sun and they bloom beautifully. I also have some mini yellow ones that are in mostly shade, and they do pretty well, too.

I say try it. Bearded irises are tough, and if they don't do well, just move them. You'd want to give them a couple years to get settled in, before deciding that they're not happy. Sometimes they need an extra year to recover from being planted.