Luminosity very good although not everybody copy

I would even say something to the luminosity here. I already have two identical LED lamps by this manufacturer.
From the first I was thrilled. The 170 lumen were achieved here loosely.
I have due to its still ordered a second LED lamp. In direct comparison, this has a much weaker luminosity.
Whether this is a defect, or a series of scattering, I can not say yet.
Who has no comparison, this is not at all remember of course.
I will now return the item and report again after the replacement.