Answer: Based on your description it sounds like the culprit is too much sun too fast. Plants grown indoors, even those grown with supplemental lights, need to be acclimated gradually to real sunshine so their leaves can adjust to its intensity. The best way to do this is over a week or so by first moving them toa sheltered spot in the shade, then to a spot with a bit of early morning sun, then to a spot with longer sun exposure and so on until eventually they are in full sun. At this point you can try setting them in the shade and begin acclimating them, be sure they are watered, and hope they recover. You may find that they continue to lose their damaged leaves but also manage to grow replacements. I'm sorry about your plants!
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