If we're talking 'instant' results then, yes, stripping and re-dyeing is the only way to go from a dark to light shade. If you have a longer (i.e. years) timeline, using the lighter polish is not superfluous. Here is a pic my 'old' chili Delray next to dark chili: I allowed them to lighten by mixing applications of chili shoe cream with walnut, mid tan and even neutral cream and wax. I also used some dark brown and black on the burnishing. I'm currently doing something similar with my dark chili Bleecker Street. It will probably be a couple years before I even notice anything and another few years before they settle into the desired shade.