Boosted power to sodium lamp, to 75% total power, equivalent to aprox. 450 Watts, so up from 300W(50%) to 450W(75%). I am using an adjustable balast, that goes from 300-600W, it has a boost level of 110% but I usually just bump it up to 100%, the boosted mode seems gimmicky and probably doesn´t make a significant difference for the plants, not as significant as it does for my electric bill!!!