I was showing mine off all week. My son and daughters friends were amazed. It’s like turning on a streetlight in your backyard. Any light that smokes my TN31’s to me is pretty damn mean. This BTU is mean.
The other driver has a 3.8A maximum in turbo (with a 3 minute timer before it steps down) and no PWM on any level.
The DRY Driver in turbo is direct drive, meaning if you have decent batteries you can get over 3.8A easy. There is PWM on levels except turbo but it is very high.
Personally I chose the non dry driver since 3000 lumens is plenty for me. Even up to 4.5A the differences are negligible due to 3 emitters being in one host.
I should clarify that the differences between 3.8A and 4.5A are negligible due to increased heat decreasing the efficiency of the LEDs.
EDIT: And not to mention you need 4x the lumens to perceive 2x the lumens. A few hundred more lumens aren’t that perceivable (even another thousand isn’t very perceivable, just look at the drop from 3000 to 2000 lumens turbo to high) and just serves to drain the batteries faster.