typically hid bulbs are shielded so they do not emit high amounts of UV,(remove glass jacket from hps/mh you would for sure have high levels of UV, but i NEVER Recomend you remove the outter shell of bulb) your LED is more likely to supply UV, not all manufactures add that spectrum, but some do advertise they do. i am not sure how much intensity of UV it takes to neutralize mold. the sun shine sure does have what it takes.
is good you have it in check now.
as i understand the main science to the use of milk i think has do with it would adjust ph of leaf surfaces to something not so friendly to mold.
i also use the lacto to make fermented plant extracts as well. one my faves was banana ,squash , papaya i used it as bloom booster.
Edited by Phungivore, 06 August 2018 - 05:41 PM.