<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div id="yui_3_16_0_ym19_1_1486488174035_3195"><span>Alan,</span></div><div id="yui_3_16_0_ym19_1_1486488174035_3194"><span id="yui_3_16_0_ym19_1_1486488174035_3193">I would ditch the two side o-rings just for simple machining. Also you give the acrylic a wee bit more clearance for </span>expansion then.</div><div id="yui_3_16_0_ym19_1_1486488174035_3194"><br></div><div id="yui_3_16_0_ym19_1_1486488174035_3194">And why are you not oil filling them? seems so simple to just oil fill them.</div><div id="yui_3_16_0_ym19_1_1486488174035_3194">Hank</div> <div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" 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 dir="ltr"><font size="2" face="Arial"> On Tuesday, February 7, 2017 8:04 AM, Cliff Redus via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br></font></div> <br><br> <div class="y_msg_container"><div id="yiv0690441502"><div><div dir="ltr"><div>Alan, looks like you are making great progress on light. A couple of comments:</div><div>1) If you plan to anodize, then I would chamfer the outside edges (85mm) to mitigate wear</div><div>2) I would use a small Subconn bulkhead connector rather than DIY penetrator. These OTS fittings are cheap.</div><div>3) double o-ring seals are probably overkill</div><div>4) LED panels get very hot. I worry about the plastic wire cover melting</div><div>5) Not showing any clearance for socket head screw heads</div><div>6) Not showing any clearance between the acrylic lens and housing</div><div>6) You would dramatically improve heat transfer away from unit if you made the fins thinner. As designed not sure these fins and shell will dissipate 80W of heat when in the air.</div><div>7) As drawn I don't see any space for wire movement for makeup after you solder the leads and start to assembly the light</div><div>8) Don't see any RTD or thermistor for measuring temperature to enable the driver circuit to protect against overheating when unit is inadvertently turned on out of the water. </div><div><br clear="none"></div><div>Cliff</div></div><div class="yiv0690441502gmail_extra"><br clear="none"><div class="yiv0690441502gmail_quote">On Tue, Feb 7, 2017 at 4:43 AM, Alan James via Personal_Submersibles <span dir="ltr"><<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></span> wrote:<br clear="none"><blockquote class="yiv0690441502gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div class="yiv0690441502yqt4020577718" id="yiv0690441502yqt66959"><div><div style="color:rgb(0,0,0);font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;background-color:rgb(255,255,255);"><div id="yiv0690441502m_-5681199526917106528yui_3_16_0_ym19_1_1486462886273_2408">Rick, Cliff & anyone else that's interested.</div><div dir="ltr" id="yiv0690441502m_-5681199526917106528yui_3_16_0_ym19_1_1486462886273_2407">Attached is the latest version of my 80W LED light.</div><div dir="ltr" id="yiv0690441502m_-5681199526917106528yui_3_16_0_ym19_1_1486462886273_2596">In one drawing it shows a larger diameter top retaining ring.</div><div dir="ltr" id="yiv0690441502m_-5681199526917106528yui_3_16_0_ym19_1_1486462886273_2611">This is to enable mounting in to a recess. By using longer bolts the</div><div dir="ltr" id="yiv0690441502m_-5681199526917106528yui_3_16_0_ym19_1_1486462886273_2789">light can be mounted on a plate at the back.</div><div dir="ltr" id="yiv0690441502m_-5681199526917106528yui_3_16_0_ym19_1_1486462886273_2658">What I like about this design is I only have to do 2 small threads for screws</div><div dir="ltr" id="yiv0690441502m_-5681199526917106528yui_3_16_0_ym19_1_1486462886273_2651">that hold in the LED. This will also help avoid bolts seizing in threads.</div><div dir="ltr" id="yiv0690441502m_-5681199526917106528yui_3_16_0_ym19_1_1486462886273_2796"> I am machining a grooved protrusion in the base to key in the rubber compound</div><div dir="ltr" id="yiv0690441502m_-5681199526917106528yui_3_16_0_ym19_1_1486462886273_2843">for sealing the wires. Inside the base I will be epoxying the wires.</div><div dir="ltr" id="yiv0690441502m_-5681199526917106528yui_3_16_0_ym19_1_1486462886273_2786">I have gone to an acrylic lens that will be 10mm from the emitter. This is because</div><div dir="ltr" id="yiv0690441502m_-5681199526917106528yui_3_16_0_ym19_1_1486462886273_2787">the small flip chip LEDs I am using are cooler out the front. I can back off the power</div><div dir="ltr" id="yiv0690441502m_-5681199526917106528yui_3_16_0_ym19_1_1486462886273_2785">if 80W is too much for such a small unit.</div><div dir="ltr" id="yiv0690441502m_-5681199526917106528yui_3_16_0_ym19_1_1486462886273_2835">These could be used as navigation lights with lower power. </div><div dir="ltr" id="yiv0690441502m_-5681199526917106528yui_3_16_0_ym19_1_1486462886273_2788">It should be good for over 2000ft.</div><span class="yiv0690441502HOEnZb"><font color="#888888"></font></span><div dir="ltr" id="yiv0690441502m_-5681199526917106528yui_3_16_0_ym19_1_1486462886273_2842">Alan</div><div dir="ltr" id="yiv0690441502m_-5681199526917106528yui_3_16_0_ym19_1_1486462886273_2671"><br clear="none"></div><div dir="ltr" id="yiv0690441502m_-5681199526917106528yui_3_16_0_ym19_1_1486462886273_2567"><br clear="none"></div><div dir="ltr" id="yiv0690441502m_-5681199526917106528yui_3_16_0_ym19_1_1486462886273_2457"><br clear="none"></div><div dir="ltr" id="yiv0690441502m_-5681199526917106528yui_3_16_0_ym19_1_1486462886273_2409"><br clear="none"></div></div></div></div><br clear="none">______________________________ _________________<br clear="none">
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