UV Torch Keyring

js58426 · 9 Aug 2013 at 04:52

I'm looking for a UV torch keyring. I've seen a few on Amazon. Can any of you recommend a decent one?

bitslice · 9 Aug 2013 at 09:17

Depends if you need it for checking the UV printing on money, looking for scorpions or being overly curious about the semen stains in your sisters bed.
All require different wavelengths.

Efour · 9 Aug 2013 at 10:52

i need one for the 3rd option.. its just a hobby.

js58426 · 9 Aug 2013 at 10:52

I'd be using it to check money and photo IDs.

bitslice · 14 Aug 2013 at 15:00

UK money requires 365nm, most cheap leds tend to be higher than this but this one looks close:

380~400nm UV Flashlight
£3.56
http://dx.com/p/380-400nm-14-led-ultraviolet-light-uv-flashlight-black-3-x-aaa-178998

UncleRuckus · 14 Aug 2013 at 15:11

js58426 said:
I'd be using it to check money and photo IDs.

So not for your sister's semen stained bed? Are you surrrreeee?

Aod · 14 Aug 2013 at 15:19

bitslice said:
UK money requires 365nm, most cheap leds tend to be higher than this but this one looks close:

380~400nm UV Flashlight
£3.56
http://dx.com/p/380-400nm-14-led-ultraviolet-light-uv-flashlight-black-3-x-aaa-178998

I think that won't work. The cheap china UV LEDs peak at 390nm with hardly any output below 375nm, certainly, the ones I have don't show up any of the hidden marks on bills, just the little flecks in the paper.

bitslice · 14 Aug 2013 at 15:42

Hmm, you may be right, the bandwidth of LEDs is a bit narrower than I expected. Annoyingly it's listed elsewhere as being able to detect money strips but that could be marketing BS.

The next cheapest solution are the nail curing fluorescents which appear to be 365nm, they'll require that awkward fitting though and they won't hang off a keychain.

I'd like to suggest buying a £2 365nm led, a resistor and a battery, but nobody builds anything any more :/

httk · 14 Aug 2013 at 18:14

Aod said:
I think that won't work. The cheap china UV LEDs peak at 390nm with hardly any output below 375nm, certainly, the ones I have don't show up any of the hidden marks on bills, just the little flecks in the paper.

bitslice said:
Hmm, you may be right, the bandwidth of LEDs is a bit narrower than I expected. Annoyingly it's listed elsewhere as being able to detect money strips but that could be marketing BS.

The next cheapest solution are the nail curing fluorescents which appear to be 365nm, they'll require that awkward fitting though and they won't hang off a keychain.

Sounds like you two are on the same wave length.