[Rockhounds] UV flashlights (repost)

Tue Mar 28 17:51:49 PDT 2017

Tim,

The flashlight being discussed takes 3.7 V 18650 Li-Ion batteries.  It is larger than a AA. Apparently it is popular for LED flashlights. It also seems to be what is stuffed into the floor of Tesla cars.

I ordered 3400 mAh rechargeable ones with a protection circuit built in. A 2200 mAh version can be had for a fair bit less than what I paid.

Jeff

-----Original Message-----
From: Rockhounds [mailto:rockhounds-bounces at rockhounds.drizzle.com] On Behalf Of Tim Fisher
Sent: Tuesday, March 28, 2017 5:08 PM
To: 'Rockhounds at drizzle.com: A mailing list for rock and gem collectors' <rockhounds at rockhounds.drizzle.com>
Subject: Re: [Rockhounds] UV flashlights (repost)

So what are the batteries? I thought they were the rechargeable Lithium AAs.

Tim Fisher
Orerockon.com

-----Original Message-----
From: Rockhounds [mailto:rockhounds-bounces at rockhounds.drizzle.com] On Behalf Of Cessna, Jeffrey T. Mr. (Fed)
Sent: Tuesday, March 28, 2017 11:40 AM
To: Rockhounds at drizzle.com: A mailing list for rock and gem collectors
Subject: Re: [Rockhounds] UV flashlights (repost)

Here are two of the posts with websites (you can of course find these on the archive if you can get to it, it required special instruction while the link was messed up).

I have a Convoy S2+ 365nm, a LW passing filter, and the special batteries on the way. So far just the charger for the batteries has arrived. So, I can't make any pronouncements yet. I did see one in action at our show recently.
Even with a filter it had more blue than I would like, but it was very bright.

As one of the websites states, looking for Convoy is not enough. They make other lights in the same housing. As a matter of fact, they will sell just the housing for do-it-yourself.

Jeff

-----Original Message-----
From: Rockhounds [mailto:rockhounds-bounces at rockhounds.drizzle.com] On Behalf Of Doug Bank
Sent: Saturday, March 18, 2017 12:34 PM
To: Rockhounds at drizzle.com: A mailing list for rock and gem collectors <rockhounds at rockhounds.drizzle.com>
Subject: Re: [Rockhounds] UV flashlights

There is a new flashlight that the fluorescent mineral community is buzzing about. It uses a Nichia 365nm LED that has very little visible light leakage (so the rocks aren't real purple) and the wavelength is true (That said, a filter is advisable). The really cool thing about it is that it is CHEAP.
The light can be bought for under $25, though you also need to add the price for a good 18650 battery and charger and maybe $2 for a filter. While it is long wave, it is REALLY bright, and can get a response from many short wave minerals. Not a true response, but enough to show you that something is fluorescent. You can find a lot more information here:

https://www.naturesrainbows.com/single-post/2017/03/01/365nm-Flashlight-Torc
h-The-Most-Significant-Innovation-in-UV-Mineral-Lights-in-Years

The only real problem with this light is that is seems to have few sources, is shipped from China, and has a variable supply chain. Ditto for the 20mm
ZWB2 filters, which are out of stock in most places. The link above tells you everything you need to know.

It is cheap, it is light, it is small. It can be easily taken anywhere. The brand is also well known for quality among flashlight hobbyists. Get one today.

Doug

PS Also the best cat pee detector I have ever used! :-(

-----Original Message-----
From: Rockhounds [mailto:rockhounds-bounces at rockhounds.drizzle.com] On Behalf Of gene at fossilnut.com
Sent: Saturday, March 18, 2017 12:06 PM
To: 'Rockhounds at drizzle.com: A mailing list for rock and gem collectors'
<rockhounds at rockhounds.drizzle.com>
Subject: Re: [Rockhounds] UV flashlights

I would recommend getting one with a filter. There are several models available. Here is one site that sells them.
http://www.fluorescents.com/uvflashlights.html 

Also consider a 405 nm Laser. Technically it is above UV.. barely, but the intense power on the spot elicits some great responses with some minerals.

Gene

On Mar 18, 2017, at 10:37 AM, Peter Richards <rpr at heidelberg.edu> wrote:

> Any comments about the best UV flashlight for mineral use, value for
money?
> 
> Thanks,
> Pete Richards
> ___________________________
> R. Peter Richards, Ph.D.
> rpr at heidelberg.edu
> Morphological Crystallographer
> 
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