yeah i used to be that guy that did spray under the HIDs.... burn doesnt look like that though..i shouldnt say that... Mine didnt look like that!! Whats your humidity... if you get up over 50% when you move plants around that are tightly packed youll often find water drops similar to what you see in the photo... if its over 60% youre almost begging for mold so watch that surface moisture as it will become an issue. If you think it may be bugs flip the leaves over idividually under HID... most critters even smaller ones are usually visible
This is kinda true. It more has to do with VPD. Vapor pressure deficit. The measure of how much moisture the air can hold. If you have more moisture in the air then the air can hold the air will start to perspire in a since, and you will see what looks like splash droplets. Increasing the temperature increases the VPD. So a room at 100 degrees will hold more water in the air at 60% humidity then a room at 65 degrees .
A lot of people assume growing has everything to do with proper temp and humidity. But VPD plays a huge role. I can run 50%+ humidity in my flower room, which helps the buds swell, because I understand VPD. And how to manage my temperature accordingly.