I went with 80 ml per gallon. Gotta watch it though, with any horticultural oil, the plants need to be completely dry before the lights come on. I raised my 1000’s in daystar hoods 6-8 inches (from my normal 20-24) for 2 days after the spray shots. Treated my ladies just great. I’m hearing that a lot of growers are mixing it up at 60 ml per gallon for the first 2-3 shots, killing everything, and then falling back to the 40 ml for regular preventive maintenance. This grower has had great success at the 40 ml rate from the beginning. Seems to me like she/he had a decent spider mite infestation that the quantum took care of even at the low rate.