Your mistake was in using the word "error" in your report. You _should_ have said, "Within manufacturing tolerance." But, I suppose it's too late for that, and you'll have to write up the new spec, as Ian Sterling has recommended.
Also, you might have to review the existing designs, just to reassure everybody (including yourself) that it really _is_ a suitable sub. (I can't imagine it not being - 1.6 ~ 1.7V is well within tolerances for an LED.)
Sorry, Rich