I need an uv flashlight for scorpion hunting.
18650 battery size
50meter range
More floody but have a spot
Budget is 30$
Check convoylight. They have a few good 365nm uv lights. If you’re in the US buy a zwb filter separately and toss it on when you receive it.
Came in to suggest Convoy too. I’m not sure you’re going to get 50m, especially with the filter.
Edit: Ultrafire have a decent selection too
Think it was the SP32-UV that threw a tight spot of UV from a reflector, but was desperately in need of a filter, as it bled lots of ghostly pale greenish white light.
Filter size was also 19.5mm or so, so a standard 20mm filter would need to be sanded down a hair to fit. (Yeah, that I remember… 
)
That said, it’s the only UV light that threw like that, as nothing else came close. Most UV lights are on the floody side, and UVLEDs don’t tolerate overcurrent very well if at all, so you can’t really push them for more range.
I did a review somewhere, but someone else also took it on a tour looking through windows of a deserted basement, parking garage, something like that. Just goggle for it…
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I find Sofirn SF16 quite spotty. It has ZWB2 filter - less visible pollution. I wonder if 365 nm peak is best for scorpions?
A convoy m21A should be plenty spotty. A bit over budget but I’d say you’ll fluoresce the buggers from far enough away with that.
I remember… was it djozz?.. who got and sold a bunch of filters that would fit a C8.
Stick a decent emitter on a star, stick that in a C8 with matching driver, use the filter, and you’d have a kick-ass UV thrower.
Consider the UltraFire RUV3. The tight beam profile could be what you desire for that kind of range. I did a review of one a few weeks ago:
slmjim
Yes, he did (quite a while ago). On the left a C8 + ZWB2. On the right an S2+ + ZWB2.
EDIT: these lights are almost invisible, but I directed it at a piece of white paper, which normally contains fluorescent agents to make it look brighter.
Alonefire has somewhat specialized on UV flashlights, maybe you can find something with them?
They come with batteries most of the time
For example: https://de.aliexpress.com/item/1005006271425957.html
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I’ve a feeling that Headborough posted on June 30th, but as the post was only approved yesterday, she may not be getting notified of replies.
This is a great rec. I have a few of their UV lights; the build quality doesn’t quite compare to Convoy, but for power per $ they are unbeatable. They also come with filters.
In particular, I picked up their triple emitter 18650 light for around $5, battery included. The output compares to my S2+ build with quad-die 5050 emitter and 3A driver.
I don’t think any floody UV light under $30 can do 50m of usable throw–for the same radiometric power, UV-induced fluorescence is usually much dimmer than white light. I would pick up 2 UV lights–the Convoy M21A with SBT10-UV-X for maximum possible throw, and then a floody light to complement it up close.