I use my foliar spray on my plants about 2 times a day. I try and do it right after the light comes on but sometimes im not available then so I just get to it when I get to it. I spray from underneath because that's where they absorb. Added a cheap light off amazon its only 25 true watts so I don't know what difference that will make but its just until my light for the new additional tent comes in so we can get these babies their own room.