Depends, in part, on the Vanda. That might be enough for a Vanda lamellata (which, if I'm not mistaken, needs less light) or a hybrid with lots of lamellata in its heritage. Probably not enough light for a standard strap-leaf hybrid to bloom, unless other conditions are perfect, and definitely not enough for a terete or semi-terete. If you put it outside for the summer it will make quite a bit of difference.
My Vanda mock me. The only one which seems to bloom regularly is a semi-terete pink thing which spikes at midsummer. It's in spike right now. I have mine outside in nearly full sun from last frost to first frost, and under bright metal halide light over the winter.
For those of us without green houses, who are not in Florida or Socal, Vanda are a labour of love. In my experience at least. I'd be glad to be contradicted though, so everyone else, please chime in.