Good lamp, but a sham

The background: Such a lamp I had and bought my son in 2013 in Hong Kong and were both very pleased. My is my now stolen. That's why I bought later me it here. A direct comparison of the two lamps I noticed that the new bulb is noticeably darker in the highest level.

A measurement on the integrating sphere has then but also showed: The WEWOM lamp makes max. 615 lumens and the lamp from Hong Kong makes at least 927 lumens. Both for measured immediately after switching on. If the lamps are warm (so after 10 sec.) The light output by 10% again goes down.

The WEWOM lamp even had a similar label on the lamp housing and the photos here on Amazon are the imprints been retouched away.

So, how many stars should I now forgiven? Even the lowest level is sufficient for everyday use, max. the second stage. On the lowest level of the battery lasts for almost a week.
On the other hand what is being advertised here, which is achieved nowhere near !! It is only 30% of the advertised luminous efficiency!

Conclusion: Who is at 2000 lumens or really needed is wrong here with this product and I will keep the lamp because it makes good light.