digi ballast

Hi, Anybody have any idea on weathrr digital ballast actually dave money on electricity cost. I have upgraded to six digis after being told i would be able to save but im not too convinced, I am running 6 600watt bulbs dimmed down to 400watt on the ballast totalling 2400 apparently is this...

Hi does anyine know the real lifespan in hrs fir a lumatek bulb run on lumatek digi ballast.it says 30,000 hrs on the packet that cant be right its bout 3 yr.i think.it always says to change bulbs every 3 months usually.am i missing something. dont wanna hurt the girls