I have the D710, the turbo mode is virtually useless and is nowhere close to 3000 lumens. The battery lasts about a minute in turbo mode so no point staying on the button more than a few seconds.The turbo doesn’t do much for sure, it does seem the increase battery drain but I never use any light on the highest setting, usually jump straight to medium, I guess if I suddenly need more light the nice thing about the 710 is holding down the button will give me that momentary burst.