thats a nice set up bro i wished i was as DIY savy as you lol but it may not have been sunburn, aparently because the led produce much more usuable light, the nutrients requird may be out of whack from what theyre used to with your old type of lighting, i could be terribly wrong though so by no means take my word for it, just something to think about!! what make and model led fixture are you using if you dont mind me asking?