Questions about UV lights

Sarge120867

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I work in the pest control industry. I am looking to pick up a good UV light to use for inspections for rodents and bed bugs. I am looking at the Nitecore MT1U at the moment but was wondering if there are better options available?
 

CobraMan

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Check out the EagTac P200LC2 UV - I picked one up recently and it is an excellent light powered by an 18650 cell and with 3 levels of brightness. I am very happy with it and would buy it again for whatever that is worth.

Cheers,
Tim
 

PhotonWrangler

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The magic term is 365nm wavelength. This is the classic "black light" wavelength. The less expensive 395-405nm near-UV lights put out a lot of visible purple and thus don't fluoresce things as well.
 

Sarge120867

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Check out the EagTac P200LC2 UV - I picked one up recently and it is an excellent light powered by an 18650 cell and with 3 levels of brightness. I am very happy with it and would buy it again for whatever that is worth.

Cheers,
Tim
This looks like a good option.
 

lightfooted

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My Nitecore P20UV works well and is according to the packaging a 365nm UV light. It also has an XM-L2 for white light. Only downside is that is has a battery spring on only one end, the head side has no spring at all.
 

syga

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I don't know about rodents, but I use a uv light for finding leaks in automotive fluids with dye.

There was another thread here that recommended this light with the 365 Nichia led, I bought it.

https://www.gearbest.com/led-flashlights/pp_277704.html

I haven't tried all uv lights, but this is the best I've ever used. Just use some clear uv blocking goggles with it. Note that it does not include a battery.
 
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Dave_H

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The magic term is 365nm wavelength. This is the classic "black light" wavelength. The less expensive 395-405nm near-UV lights put out a lot of visible purple and thus don't fluoresce things as well.

At the low end, at Home Depot I recently got a 3AAA UV flashlight for $6; uses multiple cheap 5mm LEDs and shows a fair
bit of visible, but good to play around with. Also nice that it can take an 18650.

I don't have specific use, but notice they are good for detecting scorpions! I will check under my bed right away!

4.5h / 1m drop resistance 9 LEDs Great for Leak Detection, Reading Fluorescent Inks, Detection, Scorpion Detection
(3) AAA BATTERIES INCLUDED. UV Light
.

Going way back, my first UV light was a modest cost lab-use device using mercury tube and filter. Two versions were
offered, 3660A (366nm, "long wave") and 2537A (253.7nm, "short wave"); I got the latter. Original use was finding
fluorescent minerals; later to erase UV EPROMs. I had fun making day-glow posters and powdered detergent
(with optical brighteners) light up in the dark. It still works.


Dave
 

PhotonWrangler

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Going way back, my first UV light was a modest cost lab-use device using mercury tube and filter. Two versions were
offered, 3660A (366nm, "long wave") and 2537A (253.7nm, "short wave"); I got the latter. Original use was finding
fluorescent minerals; later to erase UV EPROMs. I had fun making day-glow posters and powdered detergent
(with optical brighteners) light up in the dark. It still works.

Dave

Your experience matches mine almost exactly, I also used SW for finding fluorescent minerals and erasing eproms. I even discovered some phosphorescent rocks in our own driveway. They glowed a pale bluish-green after I turned the light off. That was the coolest thing.

And today those shortwave lamps can double as germicidal devices, especially with the filter removed.
 

Dave_H

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The magic term is 365nm wavelength. This is the classic "black light" wavelength. The less expensive 395-405nm near-UV lights put out a lot of visible purple and thus don't fluoresce things as well.

Old tube lamp is Ultra-violet Products UVS-11. Verified it works and have a spare tube from an air purifier.

In a Canadian Tire store I saw a set of UV LED "inspection lamps" which are just over-sized penlights; one 365nm, other 395nm. Don't recall the brand/price, will try to get more info next visit. Can't seem to find it online and some of their webpages hang my browser for some silly reason.


Dave
 
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PhotonWrangler

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In a Canadian Tire store I saw a set of UV LED "inspection lamps" which are just over-sized penlights; one 365nm, other 395nm. Don't recall the brand/price, will try to get more info next visit. Can't seem to find it online and some of their webpages hang my browser for some silly reason.


Dave

Interesting. I have yet to see a true 365nm LED flashlight in a regular retail store. Was the "inspection" lamp intended for detecting A/C leaks or something else?
 

Dave_H

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Interesting. I have yet to see a true 365nm LED flashlight in a regular retail store. Was the "inspection" lamp intended for detecting A/C leaks or something else?

The 365nm/395nm inspection light pair is made by/for an outfit called "Police Security". Not bad at CDN$25 but I didn't bite. At least one of the two is offered separately.

Package mentions currency checking and leaks for 365nm; blood/urine/scorpions (!) for 395nm.

Dave
 

Dave_H

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Checking the cheap Home Depot "Defiant" flashlight specs, no wavelength is spec'ed. Package
shows a glowing scorpion which is leading me to think it is 395nm.(**)

Found Coast UV 1AA flashlight PX100 which actually specs 400nm.

Side note, I watch a fair number of "who-dunnit" detective series main from England, Scotland, Ireland,
Australia, New Zealand etc. In Murdock Mysteries (Canada) Det. Murdock employs a crude (at the
time, early 1900's) UV lamp for detecting blood; in a wooden box, portable.

Dave

** hmmmm...shouldn't scorpions get compensation for their role in selling these products...they're not even on the payroll! :)
 

PhotonWrangler

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Side note, I watch a fair number of "who-dunnit" detective series main from England, Scotland, Ireland,
Australia, New Zealand etc. In Murdock Mysteries (Canada) Det. Murdock employs a crude (at the
time, early 1900's) UV lamp for detecting blood; in a wooden box, portable.

Dave

I'm guessing it was an incandescent lamp with a woods glass filter. G-E used to make a 250 watt incandescent with the glass envelope made out of Woods Glass. It was a brute force way of getting some usable UV, but it ran so hot that it could only be used intermittently per the specs.
 

Dave_H

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The 365nm/395nm inspection light pair is made by/for an outfit called "Police Security". Not bad at CDN$25 but I didn't bite. At least one of the two is offered separately.

Package mentions currency checking and leaks for 365nm; blood/urine/scorpions (!) for 395nm.

Dave


I saw this set of UV inspection-style flashlights, one 365nm and one 395nm on sale for $20 so decided
to try.

First 365nm light failed after unscrewing the cap to check batteries (no longer lit). I detemined that
the LED head was bad. Second set did similar thing, though the 395nm light seemed OK. Seems to
be a design and/or manufacturing defect at play. Both sets returned, disappointed. Other products
under this brand are not necessarily bad.

Dave
 

adamlau

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395 has its place as certain fluids flouresce under 395 that would otherwise remain (mostly) unseen at 365. 395 is what I prefer when I want to check our bathrooms ;)
 
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