<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Brian,</div><div>you would need to coat the emmitters & the wiring coming in to them.</div><div>The epoxy would stop the heat escaping, but I guess only marginally</div><div>if the coating was thin. I am not sure that normal epoxy would cope with </div><div>the heat. It may have merit. I did something like that with a flounder light,</div><div>but water got in & killed most of the LEDs. Have had difficulty a couple of</div><div>times sealing the individual copper wires at the point where they go in to </div><div>their insulation.</div><div>Alan</div><div><br></div><div><br></div><div><br></div><div><br>Sent from my iPad</div><div><br>On 1/09/2015, at 12:23 pm, Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="font-family:Arial, sans-serif; font-size:10pt;"><font size="2">Alan,<br> Can't the LED's themselves be exposed to the water with just a thin coat of clear epoxy over the top? Then maybe the back of the array could be in a small amount of mineral oil, or cover the back with epoxy as well ? I have some LED's on my kayak that I have covered with a coat of clear epoxy and I've been using them for a few years now, of course they don't get submerged.<br><br><br><br>Brian <br></font><br>--- <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> wrote:<br><br>From: Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] Light lense<br>Date: Mon, 31 Aug 2015 22:51:44 +0000 (UTC)<br><br><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div><span>Hank,</span></div><div><span>you have got me thinking. I don't want to pressure compensate because of the capacitors</span></div><div dir="ltr"><span>in the driver. I was also concerned that any fluid might yellow with the heat.</span></div><div dir="ltr"><span>According to this article, the main problem with LED lights is disipating the heat that comes</span></div><div dir="ltr"><span>out the back of the emmitter.</span></div><div dir="ltr"><span><a href="http://www.deepsea.com/wp-content/uploads/article-Application-of-High-Power-LEDs-UI08.pdf">http://www.deepsea.com/wp-content/uploads/article-Application-of-High-Power-LEDs-UI08.pdf</a><br></span></div><div dir="ltr">I could seal off the driver compartment at the back of the emmitter & fill that with oil. However</div><div dir="ltr">I will be machining this out of alluminium rod & can keep the enclosure round the driver pretty small</div><div dir="ltr">so there isn't much of an air gap to the housing.</div><div dir="ltr">Could easily experiment with & without oil to see if it makes much difference.</div><div dir="ltr">Alan</div><div dir="ltr"><br></div><br> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"> <hr size="1"> <font face="Arial" size="2"> <b><span style="font-weight:bold;">From:</span></b> hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br> <b><span style="font-weight: bold;">Sent:</span></b> Tuesday, September 1, 2015 10:09 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Light lense<br> </font> </div> <div><br><div><div><div style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;"><div><span>Alan,</span></div><div><span>I assume your going with a pressure housing? why not fill the pressure housing 95% full of oil to tsf the heat to the water?</span></div><div><span>Hank</span></div> <br><div><br><br></div><div style="display:block;"> <div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;"> <div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div><br><br></div><div><div dir="ltr"> <font face="Arial" size="2"> On Monday, August 31, 2015 4:00 PM, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br> </font> </div> <br><br> <div><div><div><div>Sorry part 2 ( ipad & big fingers)</div><div>The LED cost $11- & the driver $6-. Free delivery.</div><div>I have ordered a number of reflectors for a couple of dollars each.</div><div>The driver is quite small. With the automated assembly processes</div><div>& micro sized components, you can't get anywhere near this size</div><div>soldering on the components yourself.</div><div>Because of the heat factor I am limiting myself to the 6000lm LED.</div><div>Will be looking at the beam angle I get from these reflectors & available glass </div><div>lenses, before making up a housing. Looking for a borosilicate lense</div><div>because of the heat transfer & low expansion.</div><div>I have taken a different route from Ken, but this process he started has</div><div>been very helpful & motivating, as has been the discussion & information</div><div>that has come out. </div><div>Alan</div><div><br><br>Sent from my iPad</div><div><div><br>On 1/09/2015, at 9:42 am, Alan <<a href="mailto:alanlindsayjames@yahoo.com">alanlindsayjames@yahoo.com</a>> wrote:<br><br></div><blockquote><div></div></blockquote></div></div><div><div><div>I bought a 24-36V 6000 lm & 4000 lm LED array along with drivers, </div><div>& have another lot in the post.</div><div>The driv<br><br>Sent from my iPad</div><div><br>On 1/09/2015, at 4:09 am, Cliff Redus via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote><div><div dir="ltr"><div>Ken is in Ireland on a holiday but before he left, he had finished the design of the LED Driver power stage. Still working on the housing but have been sidetracked the last month on getting my boat ready to dive after major upgraded over the last 18 months. Hope to get back on the Light housing shortly. I did dive the new 5K LED light this weekend and it worked great.</div><div><br></div><div>Cliff</div></div><div><br><div>On Mon, Aug 31, 2015 at 8:09 AM, Jon Wallace via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><br>
What has happened with the light build?<br>
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