[jonnyfli]

intresting

[Kalbhairav]

Possibly the water that sits on the leaf gets to a certain temperature which causes the burn/wilt? Also you have to have a combination of factors that include a high air temp.

Pretty sure if you have proper regulated indoor grow then the light intensity from the bulb won't matter if air temp is in the sweet cool/warm spot. Sounds like the rule only applies to outdoor growing during the middle of a summer's day. Take a hose with water from an already warm pipe and spray your vegetable patch in the middle of a hot summers day and see what happens Not burn exactly but the plants won't be happy about it. Same goes for foliar feeding with water that's too cold.

Call be crazy but that seems pretty logical. Or am I on the wrong track?