Hi dears, I finally contacted HKequipment (seller) and asked about follow the Thrunite instructions on how to repair the issue. They answered as follow: “If you follow the instruction from Thrunite to repair yourself. It will not void the warranty” and asked about serial number for reference. I guess it is good news for me. 
Excellent……. :+1:
Again, just a straight forward heads-up reply from Thrunite with excellent customer service and fully standing behind their product! Sweet!
Is isopropyl alcohol an AR friendly lens cleaner by the way? All the description says is that it’s 70% isopropyl alcohol. When i wet some tissue paper and dab the lens with it it leaves behind liquid stains and i don’t know why. I hope it’s not actually dissolving the AR coating?
I don’t really know the answer .
Some lens that are just AR coated , and don’t have any other coatings (like AF coating that some companies call it) , are really hard to clean .
More lenses will clean great with a soft microfiber cloth .
Isopropyl alcohol has water in it which is left behind when the alcohol quickly evaporates.
A lens cleaner like Zeis pads from Walmart or any optical store, places that sell glasses or drug stores usually have them as well, these work best. They’re made for AR coated glasses so of course a lens is a lens. 
^
+1 on the Zeiss lens cleaner from WalMart. :+1:
Either the individual foil wrapped pads or the spray & microfiber cloth work great.
aha! Thanks a thousand! Had fun cloud bouncing… and spotting party balloons of all things with it!
no probs with my tn42
here it is doing what it likes to do 
Nice pic! Really shows what this bad boy does, love it!
Edit: One of very few reflectors I’ve seen that puts out a column of light that doesn’t cross over, most make an “X” pattern where the optimal focus point crosses over and flares back out, reducing effective distance. This one makes over a mile because of the great collimation of this awesome reflector, ya just gotta love it!
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Nice!!
casting shadows on the clouds and fog
Fun light, isn’t it?
sure is 
glad im not alone with this light problem ! lol !
lol!!! Somebody is borrowing[stealing!!] pictures.
A guy on CPF[hahoo] posted the same picture and claims he took it!
It might be him, it might be you or maybe BOTH of you are claiming this is your light!
See link below with his post! Post #510 and post #531 where he claims to have taken it!
Or maybe…. ‘nodoubt’ (BLF) = ‘hahoo’ (CPF) … :question:
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man, dont you have better things to do ?
i bet you were a tattletail back in grade school.
Hi Dear, I have used 99,9 isoprophyl alcohol and window cleaner (blue liquid) none of those were harmful to the AR coating (purplish or greenish) I guess the traces you see when you use 70% isoprophyl is due to the residue left of almost 30% water content. Hope this help you.
I have to smile when I see you post nodoubt… we had a good friend named Winston that worked in an Automotive parts store who used to say No Doubt! all the time! lol [ie: “These parts are EXPENSIVE!” “No Doubt!”] As such, your tattletale response above elicited an immediate “No doubt!” in my mind, making me laugh at the double entendre. (all this instead of simply saying …)
no doubt… No Doubt!
Where is your sense of humor “hahoo”? Not only disrespectful to me on CPF,no sense of humor either!