What you want to do with this plant is to give it an hour or two of morning sun, then bright for the remainder of the day. It is in the Oncidium group and as such, likes to be watered often depending upon the media it is growing in. Never let it dry out as Oncidium have very fine roots.
Because of the Miltoniopsis lineage, it would prefer to be grow a little cooler. Night time lows in the low to mid 50's and maximum highs from the low 70's to low 80's depending upon season. As long as the plant is not exposed to extremes for longer periods of time like say in the low 90's for a few weeks, it should be happy.
They bloom twice a year, spring and fall. The psuedobulbs should be plump indicating proper watering. If they start to shrivel give water more often. I would imagine if it is in a 5" pot, water it about once every week or so in the winter and perhaps once every five days when it gets warmer. Warmer meaning nights consistently in the low to mid sixties and days of 75-82.
