Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: Is this the new 820 lumen upgrade version or the older 600 lumen version?
Document: I own several different lights made by Klarus and I am faithful to the brand.I purchased the Klarus 600 lumen XT11 as an upgrade to my Klarus 470 lumen XT10.I have owned the XT10 since it first came out and I'm very familiar with all functions of both lights.XT11 Pros:1- Same great build (a few MM's longer), same Military Gray finish/color.2. Added secondary spring inside.3.
I now own both the Fenix TK21 XML 449 lumen (pre-XML U2 468 lumen) and the Klarus XT11 XML U2 600 lumen torches. Both are very good torches in their own right, but there are differences that may affect a buyer's choice. The finish on both is comparable. However, the TK21 has square threads to connect the tail and head pieces to the body for sturdier connections whereas the XT11 has rounded threads. Both have removable anti-roll rings.
Bought it about a month ago from another site. Really like it. Compared it to Surefire Fury Defender 500 Lumen flashlight, very similar power and beam and flood, although Surefire has light more whiter(if that's a matter). Excellent quality on fit and finish. Personally I don't like wrist cord with crab claw lock, I would prefer soft line instead but it's just my opinion.Overall I am very happy with 600 lumens for under 70 bucks. Recommend it for now.
You will not be sorry.I liked my new Klarus xt-11 so much I purchased a second for my car. This is one hell of a light.
It's also LED which is very nice.It's not a new brand name like Surefire or Streamlight, but it's very good and I'm sure it'll be up there with those 2 names one day.
My best friend owns this light and mine will be here tomorrow. The build on these lights is bullet proof and the two button user interface is awesome! I was so tired of the Chinese made lights that arrive with bad switches and broken parts or completely way off on the stated lumen rating so I decided to bite the bullet and fork over the cash for a light that will provide a lifetime of service.
Beats Surefire hands down. Great candle power and long battery life. Tough construction at a great price. Plan to purchase the rechargeable version.
I was worried about this at first when I read it in the manual but you really cant tell the difference. Plus it will be back at 600 lumens if you turn it of and on again.
With new supplied (Stellar) batteries installed, light was very dim. Luckily I purchased a box of Surefire CR123s as well; when Surefires were installed the light worked great. Very bright, dim and pulse modes all fine. The Stellar batteries measured 2.6 and 2.9 volts with no load. All the Surefire batteries measured 3.2 volts.
This was my first real LED flashlight. It puts out a significantly powerful beam at 600 lumens. I bring this flashlight everywhere. Always keep stacks of fresh batteries.
Answer: yes