Thanks for that comparison, that was super helpful.
My instructor made fun of me during training, but like I said I have happily used a DGX 600 for the last year (Intro dives & Full Cave class). It seemed super bright to me (except against my buddies lights!) It is interesting how we get used to a certain level of light, and only realize how much better another one is when they are out next to each other.
I started (Open Water), with a Underwater Kinetics 6xC cell light which I thought was great at the time. Then I got the LED version and thought how much brighter it was. Then I upgraded to the DGX 600 & 800 series, which seemed like floodlights in comparison. Now another year later, and I am thinking how I need yet even more light!