Michael,
How much of a difference do plain jane Alkalines drop the output? I am getting 131,000 Lux with a 10 Meter test. Also is the black rubber retaining ring around the internal optic supposed to be attached firmly all 360 degrees around. It seems to be anchored well at two points 180 degrees apart (opposite the mount screws?)and moves in-out slightly along the other axis if you touch it lightly. I noticed it looked to be in a little crooked. I'm sure I didn't break it loose when I touched it. Thanks.