Instruction: Given a question and the related document, predict if the question is answerable based on the information provided in the document. Output only yes or no.

Input:
Question: What is the exact wavelength in nano-meters of this light?  It should be something like 950nm or 850nm. Don't answer if you don't know.
Document: For the third time in a row, I received something other than an IR flashlight. This time it was an Ultraviolet light. They ought to just call it the "Mystery Wavelength Flashlight" because you never know what you're going to get.
I have been seeing a bunch of reviews about how they are getting the wrong wavelength flashlights!I bought mine from NETSPOWER! It shipped from ARIZONA! It got to me ( West California ) in two days!!! FREE SHIPPING! Even though it said 14 to 20 something days shipping time.When it got here I immediately opened it up and saw that it is the RIGHT infrared flashlight that was advertised. There is a very dim red light that comes from the three little LED's.
true Ultraviolet is not infrared, look at the chart on Wiki and you will see that Ultraviolet is not as strong as Infrared,,,,i would like to know which on this is tho????[...]
This must be about 850nm. When looking at it after become night adjusted, the LEDs and reflector are quite visible, hence the 4 star rating. When reflected off objects, the light is not visible. At 950nm, a very bright light is only barely perceptible to the naked eye, but lights up night vision (gen 3 is better in the longer wavelengths than gen 1).
I had been looking for an additional small Infrared Illuminator for my night vision gear for a while, but most are priced way outside my comfort zone.Infrared light is defined as light that is at the upper limit of the visible wavelength range, usually with a wavelength longer than about&#8201; 700 to 800 nanometers.
It takes an ambiguous battery type that MIGHT be CR123A but they call SR123 or something. Anyway, after no luck at the battery store and no light out of the device they can have it back. Other reviews mentioned getting different light spectrums from IR to just red to UV/Blacklight/Purple. Stay away.
Although the description does not state it...you need a special battery and a charger!!! The light is great in the dark...shows up any usually unseen things you may or may not want to know about...just don't shine it in your face or against any glass...way bright! Has a large viewing range...
That is some great service in my opinion.The light itself isn't bad, the build quality of the body is WAYYYY better than I thought it would be and the paint is great something that usually isn't the case on such a cheap light. It works as advertised this time and I am happy with the purchase. Is it a professional light? no. Is it great for any other purpose? yes.
This is a powerful little light. Works great as a supplemental IR with my Gen1 night vision device. It isn't super tactical because of the slight glow, but for the price you can't go wrong. It has taken my night vision device from being okay to being awesome. I have served in the military and know all about the higher end units out there.
The reason I only gave it four stars was because there are no instructions. You are on your own to know how to use it. You must know that this light takes an 18650 lithium battery with the positive end facing the lens end of the light and the negative of the battery facing the switch on the tail cap.There is a dull red glow visible when the light is on so you can confirm that it is on and working without the use of NV.
Answer: yes