"I use liquid light, especially on mothers that I am getting ready to take cuts from, I will usually spray 2-3 days beforehand. I mix it up at standard strength 60ml/l Gold Penetrator and liquid light, and I DO NOT adjust the ph.
I don't spray on plants that have entered the bloom phase or on cuttings that are not fully rooted and growing already, if there is ANY SIGN AT ALL of flower formation, and if the plant isn't still growing like its in veg I have found it can fuck up your flower formation, and severely hamper yields. Oh and make sure you follow directions and spray at least 4 hours before lights off.
Apart from not spraying blooming plants it really does increase growth significantly on those in veg although the inter-nodal distance is also increased a little as well. Overall quite a useful product despite the price tag."
Borrowed from "puffin" at another weedtalk site!
This first one is what happens when you spray flowering plants
This next one is a clone of the same age that wasn't sprayed with liquid light so you can see the effect