In reply to Any way to lighten a glyph in InDesign?:
It seems to me he wants to lighten InDesign's rendering (presumably "live", not-from-outlined) of a lot of text.
BTW since you're here it would be useful to compare Charles's desired degree of weight change to FB's weight "grades": if it's equal or greater then we have at least one -profitable- foundry that does go to the trouble to do it right.
hhp