I also have an understanding that once the blooms are open, the less light they get, the longer the flowers last. Obviously up to a point. They will expire over time no matter how much light the are in.

Personally, my flowering orchids end up rotating to the living room and there is a decent amount of light. Otherwise they live under lights, except for the ones hanging in the living room by the windows. I don't try to extend the flowers life cycle. They will bloom again.......hopefully.

And as an extra point, I am constantly amazed at how quickly some of my orchids that ended their flower cycles start new growth once the expired spike is removed. One of my oncidiums had a new growth started within a week.