Just be careful when you never expose your vandas to full sunlight, probably they will have sunburn because of sudden change in light intensity and temperature. I had this experience when I move my vanda from shading net to full sunlight exposure. Some leaves will turn into yellow (in worse case it could be brown) or in lesser case they would have black spot, however once the new leaves come, they will be OK, and in my experience it will trigger new spikes. Good luck.