Huntley, good qestion. I have found that the LL can DEFINITELY burn my plants if I leave the light on while they are drying (which the company says to do....DONT!) and even though they say it can be used every other day I've found that to be too often for my plants as well....twice a week at most. On seedlings I would only use it once a week despite the company stating to use it on ANY rooted plant over a week old. I burned a nice little nexxus plant following that advice.

I turn the lights off and put a fan on the plants until they are dry and THEN turn the lights back on.

Opie had been using the stuff at half strength and I think I will try this myself as well...This LL has a pretty good kick to it.