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Gold Prospecting
Prospecting Equipment
Recommend a UV torch for gemstones?
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<blockquote data-quote="BigWave" data-source="post: 507638" data-attributes="member: 6786"><p>Further, if it's not for field detecting, then a LED torch would be OK for close-up inspection.</p><p>Don't be fooled into getting any wavelength longer than 365nm. These would have too much visible light, i.e.: for viewing the $5 note:</p><p><img src="https://www.prospectingaustralia.com/forum/img/member-images/6786/1566284445_5_note.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p>Many LED UV LED torches (the yanks like to call them flashlights because a torch will set fire to things) do not state wavelengths or have wavelengths closer to 400nm, which give out way too much visible light. UV is strictly wavelengths shorter than 400nm, but all these lights have a spread, and much light creeps into our visible spectrum making them near useless.</p><p>One that I like the look of is the Nitecore MT1U: centred on 365nm with very little visible light output.</p><p>This could be another good one:</p><p><a href="https://www.ledwv.com/uv/uv-top-detector-light-365nm-3w-p-998.html" target="_blank">https://www.ledwv.com/uv/uv-top-detector-light-365nm-3w-p-998.html</a></p><p>Whilst UVB and UVC LED torches are becoming more powerful and cheaper, there are very few good/reliable ones about. Maybe wait for a few more years?</p><p>If you find one, then let me know!</p></blockquote><p></p>
[QUOTE="BigWave, post: 507638, member: 6786"] Further, if it's not for field detecting, then a LED torch would be OK for close-up inspection. Don't be fooled into getting any wavelength longer than 365nm. These would have too much visible light, i.e.: for viewing the $5 note: [img]https://www.prospectingaustralia.com/forum/img/member-images/6786/1566284445_5_note.jpg[/img] Many LED UV LED torches (the yanks like to call them flashlights because a torch will set fire to things) do not state wavelengths or have wavelengths closer to 400nm, which give out way too much visible light. UV is strictly wavelengths shorter than 400nm, but all these lights have a spread, and much light creeps into our visible spectrum making them near useless. One that I like the look of is the Nitecore MT1U: centred on 365nm with very little visible light output. This could be another good one: [url]https://www.ledwv.com/uv/uv-top-detector-light-365nm-3w-p-998.html[/url] Whilst UVB and UVC LED torches are becoming more powerful and cheaper, there are very few good/reliable ones about. Maybe wait for a few more years? If you find one, then let me know! [/QUOTE]
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Gold Prospecting
Prospecting Equipment
Recommend a UV torch for gemstones?
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