It should be more than 500 ft near the top of the plant because the leaves are close to the fluorescent tube (up to over 1000ft). Keep in mind that the plant is exposed to it for the full 12 hrs, while windowsill lighting can fluctuate (for me windowsill can get really low). This is a new set up for me. It's a short fish tank light for a 10 gallon tank. During the summer it was getting afternoon direct sunlight from the window, but daylength is shorter now. The window is on the other side of the room. I don't think it needs as much light as a cattleya, but more than a phal. I think like most orchids giving higher light can give better bloom displays.

I read for best blooming they need a winter temperature drop. I don't think temperature drops are as important as in deciduous dends for example. I expect night temps in the winter to drop to 18C or less in my house, I think I woke up before last year seeing 15C lol (its because I kept my doors closed and my windows are very ineffiecent, plus the thermostat is set lower at night)

Neos have been grown successfully indoors (maybe without cool winter temps too?), and I've heard of another person growing them on a desk with a lamp.

Since I haven't bloomed any of my neos or its crosses maybe someone has advice...