Ya, You don't get mold unless the environment will grow it. Like too high humidity above 60 or no fans moving leafs on the tops AND bottoms!
So...
There is no need for what you are talking about (spraying leafs for mold LOL) unless you don't know how to control your environment.
No mold is...
Crop King! If you want great seeds, big auto and reg. buds. Customer service is what YOU make of it. There are no problems only solutions. You should have got protection. Probably what the guy was telling you and you were not listening. Order somewhere else but, it sounds like you don't know...
And your screen size?
The first plant that I grew under 315CMH came out great. II currently have My screen full and 1 week from the flip. I have a lot of plant under 1 light and My space is 3.5' x 3.5'. My first plant did not have enough time to veg. (vacation plans) so, I've got her good and...