Heat a standard waffle iron and spray with cooking spray. In a mixing bowl, combine flour, brown sugar, baking powder, baking soda, ginger, cinnamon, and allspice. In another mixing bowl, combine egg whites, buttermilk, molasses, sour cream, and raisins. Add dry ingredients with wet ingredients just until moistened. Pour enough batter onto hot waffle iron, or filling two-thirds of the waffle iron. Bake for four minutes, or as directed from your waffle iron instructions.