I don't think my sneezing has anything to do with bright light. I nearly always sneeze when coming out of a 72 degree air-conditioned building, out to a very warm day of, say, 95 degrees F. Oh, and it works in reverse, as well -- from a hot outdoors to a cooled home. My problem is triggered by abrupt temperature changes.
Looking at the diagnosis of vasomotor rhinitis a long time ago, this was one of the noticeable symptoms of that condition. People with my condition have a nerve imbalance in the nasal passages.