Dicking with the spectrums and lumens is a good way to throw them into shock. Use the lights you have, or use the sun. Going back-n-forth is no good.

The plant was likely reacting to :
A) the heat from the sun.
B) the sudden increase in lumens and spectrums.
C) the UB light it was never getting before.
D) the pot sitting on the hot cement can kill bioactivity, and steam the roots.

Then there's the potential for bug issues...