Member of the Year: 2017 - Member of the Month: Mar & Oct 2017, Aug 2018, May 2019 - Plant of the Month: Aug 2017
That's the tutorial I've used for about 3 years now.
Heat Stress : Look closely below, and you'll see the brown leaf edges that are indicative of heat stress. This damage looks alot like nutrient burn, except it occurs only at the tops of the plants closest to the lamps. There's only one cure for this...get the heat away from the plants, either...