On many of those purple undersided Phals it tends to be only the young leaves that have it. As the leaves age, it fades away. Not all Phals are like that though, my Phal schilleriana has purple under all the leaves.
I think to some extent light levels will influence the color underneath (ex, in very dim light there may be less purple), but if you really want to go by color as an indication of light levels, purple on the upperside is better. Ideally you want no more than a very slight tinge of color, usually it will be on the youngest leaves as well.
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Camille
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Last edited by camille1585; 03-05-2012 at 04:02 AM..
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