<div dir="ltr"><div>To me potting or not comes down to the cost of the housing. If you can find an adequate low cost housing and that the housing fits your application, maybe like the one Alan posted, then its worth experimenting with potting. If we can not find an adequate OTS housing, and we have to machine a housing, then it makes more sense to build as 1-atm housing and utilize the mounting base so that the LED array can be change out.</div><div><br></div><div>Potting the back of the LED is not going to work. The manufacture requires that the back of the LED be in contact with an aluminum heat base to conduct heat also you need to use a thermal grease behind the array. I work if you potted the face of the LED that it would prevent adequate heat transfer.</div><div><br></div><div>Cliff</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jul 23, 2015 at 8:35 AM, Sean T. Stevenson via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><p dir="ltr">I wonder if you could pot such a light in two pours? Fill the back end with e.g. MG Chemicals 832TC, and once that cures, cover the emitters with 8322?</p>
<p dir="ltr">Sean<br>
</p>
<br><br><div class="gmail_quote">On July 23, 2015 6:57:54 AM MDT, via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid">
<span style="color:rgb(0,0,0);font-family:Verdana;font-size:10pt"><div>Before I oil compensated my 10,000 lumen LED head light, I messed around with epoxy potting. I had two problems. One is the epoxy yellowed over extended time of use as most resins and plastics do. The other is with a LED this powerful, it does give off heat and the epoxy acted as a insulator instead of a conductor. This resulted in the LED starting to burn inside the potting. Two corrections for this would be to experiment with different epoxies and / or not use such a powerful LED array as what I am using. I like my lights bright :)</div>
<div> </div>
<div>Thanks,</div>
<div>Scott Waters </div>
<div> </div>
<blockquote style="color:black;padding-left:8px;font-family:verdana;font-size:10pt;margin-left:8px;border-left-color:blue;border-left-width:2px;border-left-style:solid">
<div>-------- Original Message --------<br>Subject: [PSUBS-MAILIST] dive report<br>From: hank pronk via Personal_Submersibles<br><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>Date: Thu, July 23, 2015 5:09 am<br>To: <a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a><br><br>Hi all,<br>I went out to Kootenay Lake and did a dive with Tim and Shelly Novak yesterday. I met an engineer from Ontario, I showed him my killer light and he said "why don't you pot the whole thing instead of oil filling" Hmmm I had no response, he also said they have potted LED's for use in chemical environments. I use a crystal clear casting resin for making electrical penetrators. Might be worth a try.<br>Hank<br>_______________________________________________<br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></div></blockquote></span>
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