Why shouldn't I Foliar Feed with the lights on?

Foliar Feeding with the lights on is like burning ants under a magnifying glass. When the light hits the water, it is like going through a magnifying glass burning your plants; making you think that the plants are sick or diseased. In some cases with good wetting agents you can completely burn your plants to a crisp. Your plants must be dry when the light comes on or you WILL burn them. Burning the plants while foliar feeding will make the plants more likely to get sick.

Spinach vine foliar fed with light on.