vanda orchid leaves turning purple
 

Vasco Crownfox Red Gem

That means it has reached it's maximum of light. Reduce the light slightly and it should be fine.

concern?

No, it is not a concern, only if it gets more light it will burn which could cause problems. I have Vandas that have done the same thing and when I reduce light the leaves go back to green over time. A little pink color is good, you have a lot so I would reduce the light also.

I agree with LovePhals.
It is better than too little light.

Yes, high light but better than too little light. It just doesn't want any more than that.

When I had one it did fine when it was often getting that red tint. It died during the winter when I couldn't get enough light for it.

I always give my orchids strong light until I see this tinge then I move them a little into a slightly shadier area. That's my cue when it comes to light. I don't really rely on foot candles in culture informations cause I don't have the instrument to gauge light intensity so i rely on the leaves.

That is a good method. I just give mine as much light as I can without burning them. It seems to work well. Before I got plant lights I used to move them from window to window all winter. It works.