I also grow under lights.
For me it is basically:
1 t5ho for phalaenopsis
2 t5ho for lower light cattleyas (sophronitis), dendrochillum
3 t5ho for plants that can take punishment.
3 tubes is equivalent to about 3500FC
For now, I placed the meiracyllium next to a tiny Encyclia polybulbon in the 3x zone. Might want to move it back to 2 for a while.