What's a good amount of light for phals?

[sii]

Originally Posted by Bird Song Farm

Not quite sure by what you mean by "microscopic" progress. If your phals aren't growing as fast as you think they should be it could be a question of to much light..............

AL

How will I know that I'm giving them to much light?
I have the vertical blinds turned facing down and they are about a foot away from the window on my desk. They receive only the morning sun (sun has moved away from this window by noon) I've touched the leaves and they don't feel hot. The window in this room has been open for the past few weeks, as we've had some cool weather and don't need the AC on.
They have all recently been repotted in sequioa bark and all but 1 are in clear pots. The other is in clay. I've been kindly reminded that I need to wait until the roots are silver before I water them. I've held off on fertilizer. I've even collected some rain water and am using that to water them. This is a learning curve for me. Any advice?