Dark green leaves

[ImABrat]

Hello....I'm curious about something...I've read in several books that if your orchid has dark green leaves, the orchid is getting inadequate light. Which orchids have dark green leaves naturally? I have 3 Phal's, a dendrobium, and a vanda that all their leaves are very dark green, thick of course, but they are looking healthy.

How do I know which orchid is not getting enough water by the color of their leaves? In my Ortho book, there was a picture of 2 orchids, one that didn't get sufficient watering and the other one that did. Before reading on to know which one didn't get enough water, I chose which one I thought it was....WRONG!!! lol....it actually was the orchid that looked just terrible!!! If I had that orchid, I would think it was sick! lol

What does it mean then about the leaves and their color in regard to watering.