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: The SUREFIRE that this Cree compares-to is 200-lumens for $170 ... but the Cree is 5X MORE power for just $1.42? What's going on here?!
Document: I wanted a flashlight similar in size and design as the E2D Surefire Defender (200 lumens), but I didn't want to pay nearly $200.00 for it. I found this one on sale through Valuelink Supplies at Amazon for $15 plus $5 shipping (Ultrafire Cree Xm-l T6 Led Flashlight Torch 1000lm 501b). It arrived quickly and I was very impressed with what I got. It is very close in size to the E2D, just a little fatter which was fine. I had an E2D to compare it to and last night used them side by side.
Above all the deceving business practice by Bravolink, The listing it self is tricky "DB POWER WF 501b Cree Xml T6 3 Mode Cree Led Flashlight 900 Lumens by ultrafire" Now ultrafire is a company by itself what is that "DB Power"? He has a explanation for that. His brand is DB  Power not Ultrafire and he claims other sellers are altering the listing. How funny is that? Even more funny his DB power flashlights comes with "HWA WYS Ultrafire WF-501B" printed on them. Why not print "DB Power" instead?
I'm not going to get wrapped around the axle about the description saying 900. The CREE XM-L T6 LED head is rated to 900 lumens if driven at 10 watts. Real world, these batteries put out 5 to 8 watts max. The head is a standard P60 type form factor.They both do an excellent job. I'm SHOCKED that a $10 flashlight is actually of such good quality. It's not a $200 flashlight, don't expect it to be the most tacticool item on earth for you to "kit up" with and go do whatever the tacticool crowd does.As an Army Infantry combat vet and active Firearms Instructor I demand reliable equipment.
The 501b is simply - amazing. 900 lumens in a solid lightweight package. For over 2 years we've had the previous version 502b which is 200 lumens and we've purchased a total of 5 to have in the house  The 501b blows them away in light output and pattern. Used it for past 2 weeks as a helmet mounted bike light attaching with zip-ties. Ran on high for 1:45 ride at 70 degrees and voltage on fresh Ultrafire 2400 mah battery was only down to 3.8v. By a good margin the best light on the trail and road versus bike specific lights when comparing light output, size, weight, and cost.
Unbeatable for the price, the brightness compares to my Brite Strike 200 lumen flashlight that costs $200. I am now purchasing one of these for each of my family as a self defense device, it will blind an aggressor for at least 30 seconds.
Great little light. Much brighter than my 400 lumen cree light I purchased at a gun show for double the price. Only flaw with this one is it is not adjustable, but I new that going in. I am using the ultafire batteries and havent had a problem yet.
This is a great light ,for weapon mount or pocket, It does a good job lighting the POSSUMS in the trees or the trail to the woods. With a good 18650 battery it will stay bright for over 2 hours,though it compares better to 300 to 400 lumen lights ,900 may be a bit optimistic.It is a quality made light with an easy to operate rear ,rubber covered,button. It has a good bright center that at 50 feet distance covers about a 6 foot circle.It is easy to mount in a 1 inch ring for the gun mount and really lights up a 'bump in the night'.
Although they did work and lit up my entire living room with a clear white HID quality, after using them I noticed the light was getting hot (Danger, Danger, High Voltage!) and ended up buying the suggested rechargeable Tenergy 18650's. Those arrived and I was worried the doubled 3v batteries were going to be way brighter than (1) 18650 3.7v. Not the case. Perfect.So as a guy that really likes collecting different flashlights, you really need to try this. It will not disappoint.
I bought this light as a tactical attachment for my Mossberg 930 SX. It will be going into a tactical foregrip with a light adapter soon.The initial issue that I had with this light is that I did not note that it doesn't come with a battery. Upon going to all my local stores I found that nobody carried the 18650 style battery that it requires. They are readily available on the internet, but I wanted to try out the light to ensure it was working properly. I found out that you are able to use 2 CR123 batteries in lieu of the 1 18650.
It's an awesome light. It says it's 900 lumens but compares to my Fenix TK21 which has 468 lumens it seems to be half as bright. But for the money it was solid! However, it died on me three weeks later. I thought it was the batteries so I replaced them with new ones. It still didn't work. I will be contacting seller for refund or replacement.
Answer: yes