Light Heat Burn?! Please Help New Grower here

Hey guys, running an aero tub with GH lucas formula (8ml micro/ 16ml bloom) under 1000w HPS that I just upgraded from (2 400w MH bulbs) 2 days ago. Anyhow, everything was looking great yesterday afternoon when I checked them and this morning I took a look to find my tallest plant (13") with some sort of burn on the fan leaves. I trimmed them off, there were only about 4. I snapped a pic of one of them. Could anyone verify that this is in fact burn from being to close to the lights? The example photo is the worst leaf that I trimmed off, the others were slightly less burned. Thanks! This site has been so much help for me in the last few weeks.photo.jpg
 
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