Convoy S21A has Nichia 233B emitter
Convoy S12 has three CUN66A1G
The price quite comparable, S12 a few bucks more though
Both have ZWB2 filter
As I understood the S21A has more narrow beam.
Between the two, the S12 gets you a lot more output–the CUN66A1G has comparable output to the Nichia 233B, and you get 3 of them. The Nichia 233B is not powerful enough to justify its price, and I would only go for it if you need a lot of throw (which is rare). Historically Nichia UV LEDs have had pretty high failure rates, not sure if they’ve stepped up their game.
If you want a lot of throw, SBT-10X-UV is a much better option for just a few more bucks.
the CUN66A1G led itself is much cheaper that Nichia 233B. That’s why little bit confused.
Nichia UV LEDs have always been expensive historically. They tend to have more intensity and less visible emission, but the former doesn’t matter for most applications and the latter is leveled by the filter.
I have 4 S12UV with the buck-boost driver. They are crazy bright compared to my S2+ with a single nichia. Comparable UV light quality.
bright in UV waves or with visible emission?
do you guys agree with this article We tested the best UV flashlights of 2025! | 1Lumen reviews | Blacklight flashlights
maybe stick to SOFIRN SF16 with SST-08-UV emitter?
Both. The ratio between the two is probably similar, but the output power is just way higher 
SF16 is nice because of the USB charging, but the S12 has a lot more power. My coworker has the SF16. Depends a bit on what you need… We’re using it mainly to check the uniformity of conformal coating on PCBs. I can light up an entire board from a meter away, he has to get closer and lights up a smaller spot. For our use, the SF16 is nicer because it still has enough power (we mainly do detail inspection) but USB charging is really useful.
between sf16 and convoy s2?
Convoy s2 is better? They are identical in price
You have not yet indicated whether you prefer more output or longer distance, or whether USB-C charging is important to you. Which one is better is completely up to your preferences.
built-in usb charger is good but I have a standalone charger, so can deal with it.
I think I want clear UV light, because I’ve bought cheap UV light in a nearest store and it just doesn’t almost work
Any of the lights recommend here has 365nm LEDs and ZWB2 filters, so in terms of light quality they are all pretty much the same. I can’t spot any differences between S2+ UV, SF16 and S12 UV when it comes to the ratio of visible stray light to UV, and how stuff (ID/passport, banknotes, scorpions…) reacts to the lights.
Does the S12UV come with the buck-boost driver, it is that a special request?
Or a mod?
I keep wanting to grab one, but haven’t looked into how they’re driven yet…
I think with the S12UV you can choose either driver. I prefer the buck/boost for even output.
Cool.
I’m pretty sure I agree - it should still provide a wealth of broad UV output, even if it doesn’t immediately fry stuff you shine it on…
I don’t mind a FET driver in the right circumstances, but I won’t ever use a UV light to get a few minutes of “oooh’s” & “aaah’s”.
Sick!
Thank you!
