too much light for this paph?

[lobotomizedgoat]

I got this plant recently. It sits near a window but gets no direct sun and for most the day its primary source of light is an LED grow light. Today I noticed that a portion of this leaf that is shaded by another plant (a cattleya leaf) is darker than the rest. I would say that portion is the same color as it was when I got the plant and that the rest has lightened slightly.

My guess is that it is receiving brighter light than it was used to (I suspected as much when I put it under the catt) but how much is too much? I have another older paph nearby receiving somewhat less light that also lightened, but seems stable, if slow in growth.

Not sure how well the photo will display on other monitors. The transition line is horizontal across the center of the image with the top half being darker.