WTF is this??? pls help

been flowering 12/12 for 15 days now. for the most part everything is going well. but today i noticed this stuff. some black tips near the budding area.
what is this? will it affect anything and if so how do i fix it?
here's a couple pics of the good and the bad.

thanks

Looks a tad warm...but don't sweat it. Like my Pappy used to say "Growing pot is like masturbating...there is a general idea but everyone does it different." They look fine in the second pic.

looks like new growth burning could be alot of things need some specifics first thing is the distance of the light and specs, PH, PPMs.

i have one 600 watt HPS light in the middle. surrounding that i have six 40 watt flourescent tubes (t12's). the 600 watt isn't that close, i keep the tubes fairly close.
hope this helps. i can take more pics tomorrow, right now they are sleeping.