I've got that same setup, and it works great. However, it's not as simple as it sounds when they say that the advantage is that you get to keep the Maglite focus ability.
If you focus out far at all, you put a huge hole in the middle of the beam that is very distracting. So for a good looking and very good beam with no artifacts or holes, there are really only two adjustments.
One, open it up until the beam just barely begins to look dark in the center and then close it back up until it JUST evens out to a smooth hot spot.
At that point, it looks very much like you expect any good quality LED light to look like, and with no artifacts, and that's the position that will give you the widest hotspot and a good sidespill. That's where I leave it set 90%+ of the time (I'm tempted to glue it in place at that position
)
The second position is to just barely nudge it a little more closed until the hotspot gets as small as it can. That's the point at which you'll get best throw but with a little less sidespill than what I described above.
Consider those two positions as an "A" or "B" setting rather than as a variable focus thing. Focusing to any other positions than those gets pretty ugly pretty fast.
I was playing around just after dark tonight and happened to have two lights with me so I flicked them both on.
Totally interesting to me is that the Maglite 3-D cell with the TLE-6EXB and adjusted the "First" way I described above, looked EXACTLY to me like the Turbo setting on my Fenix L2D/Q5.
And I do mean EXACT with regard to brightness as well as the size of the hotspot and the sidespill area.
The only difference I could tell was a slightly different color between the two, but I know that I only noticed that because I held the two beams side by side on the same wall.
My L2D is advertised to throw 180 Lumens in Turbo mode, and the Terralux is advertised to throw 150 Lumens, but it sure was hard to see the difference between those two lights except that the L2D appeared to be the slightest bit whiter to me.
Hope that helps. The Terralux is a decent drop-in that transforms a mediocre Maglite Krypton into a nice, useable flashlight, and then you get the bonus of more run time over the original Maglite.
