Let's see.... oncidiums can take from 2000 to 5 or 6000 foot candles of light, with the plants with thicker, fleshy leaves taking the higher amount and plants with thinner leaves going with lesser light. Morning sun would probably be okay on this one for a few hours. Thin roots mean water more often, don't let it totally dry before the next watering. And because you water more often, the humidity doesn't need to be as high for many oncids- 30 to 50 % . If your oncidium has thicker roots (like a phal), then water less often and allow to dry a bit more.Temperatures, I wouldn't go below 50 degrees farenheidt at night and around 80 to 85 during the day.