Do most orchids have bloom triggers like temp or light?

[Rothrock42]

My guess is that they all have bloom-triggers. But that you'd have to be an orchid of that kind to be tuned in to them. And that even some of the more obvious ones which we (strangest orchids of all?) might notice are combined with other more subtle ones.

That would explain why some people swear you must give your phal a bit of cold, and others are like "Meh."