Choosing grow lights

[Pollicino]

Hi guys!
I'd appreciate it if somebody could help me choose a new set of grow lights for next autumn and winter.
I'm growing Phalaenopsis hybrids, nothing special, but I want to do things right now and supplement with artificial light during the next months.
In a year or so I'll be moving and I plan to build a proper orchid cabinet with LED strip lights. However, for the time being, I'd prefer a less expensive and especially more space-saving solution.
So here is my question(s). Is it a good idea to use a LED bulb, I mean an E27 or E26 bulb, mounted on a standard Ikea desk lamp?

If so...

1. How to choose the correct wattage? I don't want to fry my poor plants.
2. And what about the spectrum? There are plenty of cheap LED grow lights on Amazon, but I'm afraid they are a waste of money...
3. How many Phalaenopsis (9-12 cm pots) can I fit under a single lamp?
4. What about using the front phone camera to measure the light flux? Has anyone used one of these apps and a light meter to check the calibration?

Any other idea or suggestion is more than welcome!
Thank you so much,
Irene