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: Does it fit the streamlight polystinger?
Document: Excellent fit perfect with no problems. High quality super super bright. I have another streamlight flashlight with C4 bulb. When I compare the to. I see no different in brightness. The only thing is you only have on or off. No high med low functions.
I love it. It gave new life to my old Polystinger and is super bright with great range. I guess I've had it over a year now with no problems at all.
The upgrade kit fit right on and it works really bright , may be 3 times much brighter than the original one.
Just to start out I work with le and this upgrade for the stinger is an awesome product. I purchased 3 to upgrade all my sting lights even the polystinger got the upgrade. So far they have all been used and i even did some drop testing on one due to some of the other comments about the led coming loose. No problems here after being dropped and banged on. So i would say the best and most affordable upgrade and the light output is amazing.
good product, good price fast delivery exactly what I expected. would purchase from this seller again. installed them right away and it fit perfectly. the light is much brighter than the old bulb that's for sure.
Works good. I have an older (12 year old) PolyStinger that I installed this on. The upgrade is not plastic to match but instead is metal. It does come with a rubber surround to install on the end so it doesn't roll. Luckily I read a tip on the instructions that mentioned mounting this the opposite way (for older models with clear plastic interior) in order for it to turn on. Otherwise it didn't work mounted with the groove lined up with the screw.
I installed this LED kit on a 12 year old polystinger and it works great! Installation was easy and I feel like I just got a new flashlight. After I put in the new bulb I took it outside and tried it against my almost new polystinger LED. The TerraLux beam was not as tight and not quite as bright but that could be because the battery in my old polystinger is at least 5 years old. I am very happy with my product.
This kit seems to be a quality piece. Installation was quick and easy. The light is a lot brighter but you lose the ability to focus. I use it at work daily and don't miss focusing as much as I thought. I read in other reviews that the kit makes the stinger longer. It made the light just long enough that it wouldn't fit in the holster. Still a great kit and pleased with this purchase.
great product. have bought multiple of these and they are an outstanding way to update an outdated streamlight flash light
This is a MUST upgrade for your streamlight! Very bright and exceptional quality! It looks like precision machining. Highly recommended!
Answer: yes