Phal light question?

[Phal grower]

Hi all!

Just had a quick question about this phalaenopsis. I grow under lights and all of my other phals are growing new leaves that get progressively bigger. However, this phal seems to be getting smaller leaves as time goes by. It is a purplish color where all my others are green as you'll see by the picture.(sorry bout the dropplets as I just watered it). Other than that it seems healthy. So, does anyone know if it should get more or less light than the green phals? Or, if you have another idea??? Thankyou.