“Light and Space” has long conjured a sort of meditative bliss-bath. Yet this loosely defined Southern California art movement of the 1960s and ’70s is more challenging and penetrating than that image implies, its best works spurring a full-on recalibration of the senses. As proposed in a far-reaching exhibition currently on view at the Museum of Contemporary Art San Diego, “phenomenal” is a better term than “Light and Space”—not just laudatory but more keyed to the work’s consuming immediacy.