Any water put on the leaves during photoperiod will cause those burns. Spraying or splashing leaves helps during seeding/cloning, but isn't that important thereafter, except to keep your leaves/plants clean. Dirty plants are prone to disease/mold as the stomata (microscopic holes in the leaves become clogged and cannot function properly. However, a plant with excess moisture is prone to mold and diseases as well, especially as there is more and more vegitation and high humidity becomes an issue. The key is to find the happy medium to eliminate all risk factors.
I would suggest getting a green light bulb and a small compact lamp for it so you can do work in your space when the lights are off. The plants will not photosynthesize green light well as they reflect most of it, so the effect is less than that of clear moonlight in nature.
This allows you to essentially work "at night" which is night to your plants(my lights come on at 10pm to minimize high temps.) If you mist, splash, or spray the leaves with water, it's best to do this "at night" as the water has time to evaporate before harmfull light rays burn your leaves. Think of this as a subtle summer rain in the cool of the night, plants love it. Also, feeding and watering is best done in the "morning" so try do do all of that stuff as soon as the lights fire up.
Down the road......THC content is at it's peak in the morning, so harvest when your plants are conditioned to having the light come on.