I have a similar lamp of UltraFire but only with a CREE LED MAX given there. Lumen number is between 1000-1300 on the Internet. Although I'm sure not even be achieved in 1000!
Same case here! .... 11 000 lumens? In life is not! ....
However, use 18650 batteries that can be used in the flashlight fall prop it back and forth in the air, since no sleeves are.
But good value I think is OK !!! a Maglite cost just as much and is really not nearly as bright! Even the LED model!
So who does not expect too much can confidently buy a ... to see what you do at night is sufficient, this lamp!