My Readings tested at 10 meters.
At 2seconds switch on 907Kcd.
At 30seconds 889Kcd.
Depends when they took there reading after switch on. All I know their specs are not right for ansi measurements and I also like to know why such low readings for advertisement. Michael did his tests with a Gosson Mavolux 5032 lux meter. I also did the tests myself. I got both TM38 and TM39 and the TM39 is much much stronger that I promise you. You cannot compare apples to oranges.
https://gossen-photo.de/en/mavolux-5032-b-usb/