Leathal, actually, no.
I know it looks like it, and was surprised when I saw the effect, but I just placed the plant on the dining room table which has a north facing window (equivalent to your south facing windows)and that is just the daylight light coming through our vertical blinds in the window.
It is probably the light between two of the slats in the blind that caused it.
Gee I'm good to be able to recreate studio effects without trying.
