No Ben not dirrect sun all day long. I have mine outside on a bench with a piece of latus between the plants and the sun. Plus there are other plants hanging from the latus that gives extra shade. I will get the foot candle measurement for that type of orchid when I get home and can look in one of my books. I think its atleast 2000 foot candles though. I would say mine are getting between 3000 and 4000 easy, but I haven't checked that yet. Full sun here in GA during the summer is between 6k to 8K foot candles. So from what I gathered earlier you said you had a balcony that got morning sun, but started to get shaded around 11 to noon right? You want to protect almost any orchid between 1130 till about 3 or 4o from full blown dirrect sun unless its a vanda or others species that likes that. Oncids like high light to flower, but by no means is it full sun all day. You need more light, but without knowing the exact conditions I can't say your balcony will be fine or not. From the sounds of it though your balcony sounds perfect. I would venture to say 50% shade would be great. Thats about what I am growing under during midday on my bench. Assuming the latus blocks 50% sun and then the plants hanging from the latus also adds shade, BUT during the morning time and late evening the sun is coming in at an angle so the hanging plants are not much protection. I will take a picture of it now since It is filling up, and you can see how I grew mine last year. At the moment I don't have my oncids outside because I was moving the Catts out first and its filling up fast, but my GH has pretty high light too. Its just two layers of drop plastic and 50% shade cloth. I will take a light reading in the GH tomorrow too. I have to make another bench this year for the rest of the plants. I have to get all of the plants out the GH so I can remodle it.
I know for a fact your plants need more light, but I would hate to recomend someplace that sounds good from the descriptions, and it be too hot and burns the plants up. Remember if you move them to higher light your going to need to water more than once a week, or you will shrivel your plants up faster than you can blink. I water about every other day, and if its a hot day I water every day. I know some people who water twice a day. So you need to remember that as well. Also since you have more than one plant now you are able to experiment a little too. I duno if you remember me saying this before or if you read it, but ANY orchid advice should be taken as guidlines and never the gospel. What works for me may not work for you, and you could live right next door. Since you have multiple plants you can leave one inside in the brightest window. Place one in slightly higher light outside, and another in more light and so forth then watch the plants. See how each is doing, and then you will get a beter idea of what the plant is looking for. Remember the plant will grow in less light, but it will more than likely not flower. The plant that you water more will grow faster, but remember the plant needs to dry out faster in order to water more. The increased light increases transporation. The increased transporation increases water need thats what helps dryout the pot faster. Just some things to help out. If I was you I would do the experimentation aspect. You would not believe the ammount of orchids I have killed before I started grasping the art of reading what the plants need, but its the best way to learn, and since I would venture to say that this plant is not an expencive awarded plant (I'm assuming its a NoID) if it were to kick the bucket. It wouldn't be a total loss since you have enough to keep one inside where you know its growing, but not flowering.