Initially this is what I did, the led lights are much more intense with a tighter spread and was double what the hps bulb was putting out.Have you measured the amount of light you're hitting them with? It's easy to overdo it with LEDs.
The plants recovered well.
But then I turned exhaust/intake fans on and turned the 250w hps upto 400w few days later this starts to happen!
Maybe I don't have enough humidity??