Just tapped my 2nd attempt at a helles. This one was hopped with tettnanger and lagered for 3 months, no gel fining. Terrible lighting and the glass fogged up a bit but you can see drywall texture through it, so I'd call it clear. Not bad head. Great taste I think. This one seems more earthy than the one I did with hallertau. Hallertau seemed more spicy. In my opinion not directly interchangeable.