Old 04-11-2016, 05:19 AM #17
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Default Re: 365nm UV flashlight danger ?

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Originally Posted by lazerman121 View Post
However if you had done your research...
I know full well the lens is more opaque than the cornea.

You said the cornea stops near UV. I said it doesn't. It's as simple as that. Don't try and pretend I'm the one that made the mistake here.


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Old 04-13-2016, 01:25 AM #18
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Default Re: 365nm UV flashlight danger ?

Wear contact lenses - those stop uv near the cornea enough, at least most of them
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Old 04-13-2016, 03:31 PM #19
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Default Re: 365nm UV flashlight danger ?

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Originally Posted by RB astro View Post
Ok guys, this looks fascinating but what would you use it for?
Sorry for the noob question, just curious...
RB
UV lights are popular with people who like to find rocks and minerals that fluoresce (glow in the dark under the light). They are also useful to people who have a pet that might be peeing in the house. Dried urine, which is unnoticeable in ordinary light, will fluoresce under the UV light, making cleanup easier. Certain other body fluids fluoresce also. Also desert area dwellers use them to find scorpions whose shells fluoresce under the UV. Many uses.

Ed
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Old 04-13-2016, 03:44 PM #20
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Default Re: 365nm UV flashlight danger ?

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Originally Posted by CoherentRays View Post
UV lights are popular with people who like to find rocks and minerals that fluoresce (glow in the dark under the light). They are also useful to people who have a pet that might be peeing in the house. Dried urine, which is unnoticeable in ordinary light, will fluoresce under the UV light, making cleanup easier. Certain other body fluids fluoresce also. Also desert area dwellers use them to find scorpions whose shells fluoresce under the UV. Many uses.

Ed
I know a guy that goes scorpion hunting with one. Never wanted to go with him.

Excellent for finding rubies though. I'd be using one if they were more common where I live. Might help find uranium.

Everybody should have one to check their hotel rooms though.
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Old 04-13-2016, 04:00 PM #21
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Default Re: 365nm UV flashlight danger ?

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Everybody should have one to check their hotel rooms though.
Yup, I was thinking that when I said "other body fluids".

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Old 04-13-2016, 06:39 PM #22
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Default Re: 365nm UV flashlight danger ?

Considering that an 8 watt 365nm LED puts out 12mW/ cm^2 at 15 inches from the light, how much can you see with a 3 watt flashlight? I'm curious if these have been used to try to actually see things fluoresce at a distance.
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Old 04-13-2016, 06:43 PM #23
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Default Re: 365nm UV flashlight danger ?

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Originally Posted by diachi View Post
Thanks for posting the graph Cyp!

Surprised transmittance goes down that much with age. I guess that's why life seems a little darker every year.
ow.

-Alex
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Old 04-14-2016, 02:35 PM #24
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Default Re: 365nm UV flashlight danger ?

I finally received my Convoy 365nm light the other day; here are a few pics. Sorry for the poor quality.
Not sure how well it will work at a distance, and haven't checked for body fluids other than a concrete floor where my cat had puked, and been cleaned up to where you couldn't see it with the naked eye, but it showed up well with the UV exposure.

PS - mortuus, sorry for the threadjacking!




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Old 04-14-2016, 03:16 PM #25
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Default Re: 365nm UV flashlight danger ?

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Originally Posted by BowtieGuy View Post
I finally received my Convoy 365nm light the other day; here are a few pics. Sorry for the poor quality.
Not sure how well it will work at a distance, and haven't checked for body fluids other than a concrete floor where my cat had puked, and been cleaned up to where you couldn't see it with the naked eye, but it showed up well with the UV exposure.

PS - mortuus, sorry for the threadjacking!




I'd appreciate it if anybody could try it at a distance. Maybe put some GITD objects in your yard and see if it excites them at a distance. I'd like to try one for rockhounding.
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Old 04-16-2016, 06:43 AM #26
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Default Re: 365nm UV flashlight danger ?

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Originally Posted by diachi View Post
Thanks for posting the graph Cyp!

Surprised transmittance goes down that much with age. I guess that's why life seems a little darker every year.
Well, until you get cataract surgery and lose some of the yellowed lens that filters out the wavelengths.
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Old 04-16-2016, 04:03 PM #27
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Default Re: 365nm UV flashlight danger ?

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Originally Posted by Rivem View Post
I'd appreciate it if anybody could try it at a distance. Maybe put some GITD objects in your yard and see if it excites them at a distance. I'd like to try one for rockhounding.
Rivem, I attempted a test at approx. 30+ feet, using a jar of Uranium marbles. I was surprised that they floresced at all at that distance.
Below are a couple of pics showing the amount of florescence; I'm fairly impressed for an $18 UV light!

@ Bionic, I've been wondering about that myself, since I've been advised by my opthomologist that I have early stage cataracts, and will need them taken care of at some point.
I wonder how much, if any, protection they give you from exposure to the reflected light we encounter in this hobby?




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Old 04-16-2016, 11:21 PM #28
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Default Re: 365nm UV flashlight danger ?

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Originally Posted by BowtieGuy View Post
Rivem, I attempted a test at approx. 30+ feet, using a jar of Uranium marbles. I was surprised that they floresced at all at that distance.
Below are a couple of pics showing the amount of florescence; I'm fairly impressed for an $18 UV light!
Thanks man. I might tack one on to an order from Gearbest soon.

There are a few uranium mines around where I live, so I may try it out. Not sure how well common ores fluoresce, but beats using the geiger counter.
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Old 04-17-2016, 12:15 PM #29
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Default Re: 365nm UV flashlight danger ?

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@ Bionic, I've been wondering about that myself, since I've been advised by my opthomologist that I have early stage cataracts, and will need them taken care of at some point.
I wonder how much, if any, protection they give you from exposure to the reflected light we encounter in this hobby?
I doubt it provides that much protection, but it might affect how we perceive the color balance of light. I think there have even been attempts to factor that into CIE-type color model.
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Old 04-18-2016, 01:35 AM #30
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Default Re: 365nm UV flashlight danger ?

Hehe... cataracts are not a laser safety device

Positive side is that they can at least be treated quite sucessfully. My mother had both eyes done a few years ago and got full HD back after two outpatient treatmens
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Old 04-25-2016, 11:00 AM #31
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Default Re: 365nm UV flashlight danger ?

Didn't notice this thread before. Thanks for the information everyone as I own a couple UV lights myself.
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Old 04-25-2016, 11:17 AM #32
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Default Re: 365nm UV flashlight danger ?

If anyone is looking for one of these Convoy 365nm UV lights, Gearbest is having a sale on them; $17.69 with the coupon code!
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