I am another newb with vandas (less than a year) although I have managed to rase my vandaceous collection to about 15 mixed hybrids and species mature and seedlings. I grow them indoors around south-east windows with no additional light, we keep thermostat around 21-22 celsium year round. Here are my observations:
vandas are the toughest orchids I ever had, even rootless cutting will produce new roots and survive;
they need several hours of direct sun to initiate spike;
mature and seedlings do great in glass vases soaked once a day and produce great roots, at the beginning I was soaking them twice a day, morning and afternoon, for 15 minutes, but now I got lazy and do it just once for longer time(half hour to an hour) after work with the same effect;
several small seedlings I keep in the plastic vanda baskets with a handful of coconut husk chips, basket sits inside of square clear plastic pot, those get watered every second day and show great root growth too;
I got Vanda coerulea in July and it got overheated, lots of leaves had ugly yellow patches and some started to get brown. I couldn't stand the look of it and peeled all those leaves off (quite harsh treatment) uncovering fresh green stem and now almost each leaf node produces new root;
they are quite tolerant to root trimmings and will produce new fresh green roots in no time;
I fertilize irregularly, less than once every two weeks;
they take water from the sink, but I make sure it is lukewarm;
even though they like sun, the small seedlings have to be introduced to sun gradually, otherwise they will burn
(I burned to death small Vanda liouvillei seedling in one day and am still crying about it,Clouds doesn't have them anymore
);
mature vandas and adapted(is this the correct word for those wo was introduced to sun gradually?) seedlings are fine with direct sun on my window from the sunrise until around 1 pm without any protection.
key with them is water, sun and warmth;
sorry for the long post