Purple tinge on new growths.

[smweaver]

Originally Posted by isurus79

My goal is to get purple on the leaves. If its a plant that has the ability to turn purple and there's no color change, I consider the light insufficient for the plant.

Same here. And some cattleyas--especially amethystoglossa and bicolor, in my experience--get lots of purple spots and blotches all over their new leaves without showing any sign of burning (the spots eventually fade once the plants come back indoors in the late fall). I think the spots are just the new growths' version of suntan lotion.