If it helps at all, I switched my plants in veg from 400w hps to an led that is 1000w and my girls in flower (a range on 2 to 6 weeks along) from 1000w hps to 1600w in leds. I was having a problem with too much heat so I did a straight switch and they responded pretty good, however if I we're to do it again I would do like Afgan King said and ease them into it over the course of a few days.