New phalaenopsis leaf yellowing

[spt4261]

Long time reader, first-time poster here! So, I have a grocery store phalaenopsis that I brought back from the dead. It's had a mealybug infestation and crown rot. Its leaves went limp and leathery and, on more than one occasion, I almost threw it out. In the midst of all of this, we moved to an apartment with north facing windows that prompted me to start supplementing with grow lamps. The phal suddenly revived with lots of new root growth, new bloom spikes off of the previous cuts, and a new tiny baby leaf. I thought everything was back on the right track until two days ago when the new leaf turned yellow (see attached photos). The plant is in a clay pot and is definitely not over watered and is showing no other signs of distress. I'm guessing this might be from too much light from the grow lamps? I'm not sure how to modulate the light from my lamps (particularly since the rest of the orchid seems to be thriving under these conditions). My biggest question is what will happen to this leaf? Any chance it will continue to grow? Should I cut it away?