Phalaenopsis is an epiphytic orchid; the bark mix you describe is fine. Never use or mix potting soil of any kind with an orchid because their drainage needs are too great. We pot orchids for our convienence but in nature they grow on trees with no potting substance at all. I move mine to lower light conditions (like my family room) when they are blooming so I can enjoy the flowers. When it is done blooming, you can move it to one of the lights you have on your desk placing it inches from the plant.
One of three things will happen: The plant will thrive and bloom for you next year, the plant will just grow leaves but it will not be getting enough light to produce flowers, or the plant will die. It's worth a shot!
It's never a good idea to pick a day and water on that day. Watering needs change with the plants activity, what type of medium it is planted in, room temp, heat from lamps, a million reasons. I'll include this little tip for you; it's cheap and fool proof.
http://www.orchidgeeks.com/forum/orc...f-orchids.html
Keep us up on your progress! We might be amazed that you could grow a Phal in an office with so little light.
And welcome to the forum!
