The "shade 2" of the Crystal 2.0 is very deceiving. I would call it "shade 0.5", as there is practically nothing there! The e684 is like 10x as dark! The other hood that I have is what I would call a real shade 2 is the HTP Striker CSV. That one is lighter than the e684.
I was using it yesterday, and I realized I have to retrain my brain! I keep thinking that, even though the hood is down, that I don't even have my hood on and for a split second it freaks me out right before I strike the arc. Its like one of those "oh schit! I almost blinded myself ! Where is my welding helmet" kinda reactions! It is stupid-nice! I recommend this helmet over any welder or welding product/consumable ever.
You think you're happy. Until you try the Crystal 2.0, you wont realize just how miserable you are!
So I fired up the Invertig 400 to test out the Crystal 2.0 at high-amp TIG. Right now it will output a max of 350A since it is still on 1-Φ power. I tested 250A, 300A, 350A. At 350A, the tip of the tungsten is still discernible, but just barely. I prefer to see the tip of the tungsten 100%; I don't like it when it is obscured by the arc light being too bright.
For my eyes, I would say 350A on DC is the absolute max I'd want to use with the 2.0, unless you put on some sunglasses. It is tolerable for a little bit, but I suspect it might be too bright after about 30 seconds or so. So IMO, the Crystal 2.0 has a realistic upper limit of 275-300A DC, depending on your eyes. I haven't tried aluminum yet, but since it is usually brighter, I'm going to guesstimate 250-275A for AC TIG. I don't think that's big deal for the clarity you are getting. I'm just gonna order some cheapie polarized sunglasses off ebay to see if I can get away with 400A later when I have 3-Φ; just have to add a little darkness to it.
