worth the money in power?

I run a 600w dimmable ballast on 75% power would it be worth the extra money in power to turn it up to 100% power for the last couple weeks?

Im pretty sure ull get alot more prof from the plant once its done thats if u trim an do everything right. Im on my first grow an im usin 250 wats right now nd my plants r coming out good and strong

My last grow i used it on 100% got a lb outta 4 ladies turned it down this time to save a lil on power