The plants have been under artificial lights for 3 weeks since they arrived. Every 2nd photo has an * to indicate new growth.
Under T5s (On average, each plant lost about 3 leaves i.e. blackened, then removed. And produced about 2-3 new leaves)
Under LEDs (The plants did not lose any leaf i.e. no blackening at all. And produced 3-4 leaves each!)