There are no "optical brighteners" in architectural wall paint, merely different qualities of white support pigment: titanium dioxide at the high end of reflectance, calcium carbonate in the middle, silica at the cheapie end, and more often, some kind of blend of these. None of them fluoresce. But the brighter the paint, the more any surrounding light contamination will get bounced around. And I really don't care who says what. You might get away with certain compromises making ordinary prints, but if you develop a relatively high-speed film in trays, you might get stung in the shadow values.