Hey man,
My apologies definitely, I misunderstood the post I got my information from and thought the method you were following still had you at .1 EC and you were working your way to .9. By no means is 1.2 EC underfeeding, I've burned a plant at 1.0 EC one time and even when I brought it down to .9 it still burned. I don't think the lights would cause the issue, it was definitely lock out related if you were up to .9 it's highly unlikely it was underfeeding. I'm all for being corrected and take no offense at all to it, hope she keeps recovering!