I have a phalaenopsis orchid in my apartment in Buenos Aires and it gets almost no natural light because it's in a hallway. I'm thinking about buying it one of those LED panels they sell at Bazar Plus, but I don't know how many hours a day or what intensity it needs for it to bloom well.
Phalaenopsis orchids don't need as much light as other orchids, so an LED will work pretty well. Ideally you want to give it between 12 and 14 hours of light per day, without it being too intense. That's what they call "strong indirect light" or a bit less. If the LED you find at the store doesn't specify the intensity, look for one with a power dimmer, so you can adjust it depending on how the plant responds. The most important thing is that it's at a good distance: between 30 and 50 centimeters from the leaf, depending on how powerful it is. If the plant starts looking burned or with spots, move it back a bit.
For it to bloom well there also needs to be a temperature change between day and night, so the LED alone isn't enough if you want it to flower regularly. That said, many apartments in Buenos Aires get good results with just artificial light if you keep that in mind. The orchid also needs decent humidity and to not get direct airflow from heating or air conditioning. Try placing the LED for a few weeks and see how it responds: if the leaves look greener and more vigorous, you're on the right track.
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