<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1438023673532_27557"><span>Hi David,</span></div><div dir="ltr" id="yui_3_16_0_1_1438023673532_27556"><span id="yui_3_16_0_1_1438023673532_27555">you can get really simple with these LEDs & run the emitter straight from</span></div><div dir="ltr" id="yui_3_16_0_1_1438023673532_27560"><span id="yui_3_16_0_1_1438023673532_27559">the power source. The light intensity fluctuates with the heat, but with the</span></div><div dir="ltr" id="yui_3_16_0_1_1438023673532_27562"><span id="yui_3_16_0_1_1438023673532_27561">light intensity we are talking about, it might not be noticable. The trick would</span></div><div dir="ltr" id="yui_3_16_0_1_1438023673532_27562"><span id="yui_3_16_0_1_1438023673532_27817">be picking a voltage low enough so that it didn't get too bright & burn out the </span></div><div dir="ltr" id="yui_3_16_0_1_1438023673532_27562"><span id="yui_3_16_0_1_1438023673532_28267">emitter when it </span>warmed up. </div><div dir="ltr" id="yui_3_16_0_1_1438023673532_27562"><span id="yui_3_16_0_1_1438023673532_28266">Next step up in simplicity is to just stick a resistor in series, & there are</span></div><div dir="ltr" id="yui_3_16_0_1_1438023673532_27562"><span id="yui_3_16_0_1_1438023673532_27821">calculators for this on line. I am wondering if a thermister instead of a resister</span></div><div dir="ltr" id="yui_3_16_0_1_1438023673532_27562"><span id="yui_3_16_0_1_1438023673532_28038">would be a good idea, as this would restrict the current as the unit heated up.</span></div><div dir="ltr" id="yui_3_16_0_1_1438023673532_27562"><span id="yui_3_16_0_1_1438023673532_28037">It may be a good option for running out of water if the thermister values were right.</span></div><div dir="ltr" id="yui_3_16_0_1_1438023673532_27562"><span id="yui_3_16_0_1_1438023673532_28201">The beauty of this system would be that you would only have 2 components</span></div><div dir="ltr" id="yui_3_16_0_1_1438023673532_27562"><span id="yui_3_16_0_1_1438023673532_28200">that you could damage by heating. The down side is a reduction in efficiency</span></div><div dir="ltr" id="yui_3_16_0_1_1438023673532_27562"><span id="yui_3_16_0_1_1438023673532_28199">over a buck driver type system.</span></div><div dir="ltr" id="yui_3_16_0_1_1438023673532_27562"><span id="yui_3_16_0_1_1438023673532_28329">Cheers Alan</span></div><br> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1438023673532_27599"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1438023673532_27598"> <div dir="ltr" id="yui_3_16_0_1_1438023673532_27597"> <hr size="1" id="yui_3_16_0_1_1438023673532_27602"> <font size="2" face="Arial" id="yui_3_16_0_1_1438023673532_27600"> <b><span style="font-weight:bold;">From:</span></b> Seaquestor via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Tuesday, July 28, 2015 3:10 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] LED Lights<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1438023673532_28332"><br><div id="yiv8681398192"><div id="yui_3_16_0_1_1438023673532_28334">
<div id="yui_3_16_0_1_1438023673532_28333">Hi Cliff, maybe Phil could chime in on his led he demonstrated at his shop for use on the deep workers. It had only a flexible membrane over the oil compensated led housing. I think his design is about as compact as you can get, and I recall it had now fins, but run a voltage up to around 200+ volts. Seems to me that simpler the better, is the idea here. For me I will testing my design hopefully next week. with 4 leds, wired for high and low. Based upon alum cost, machining, leds and subconscious connector I'm coming in around $500 for each light. Cost may drop with multiple units. But one off is always more expensive.</div><div id="yui_3_16_0_1_1438023673532_28335"><br clear="none"></div><div id="yui_3_16_0_1_1438023673532_28336">Best Regards,</div><div id="yui_3_16_0_1_1438023673532_28337">David Colombo</div><div id="yui_3_16_0_1_1438023673532_28338"><br clear="none"></div><div id="yui_3_16_0_1_1438023673532_28339"><br clear="none"></div><div><br clear="none"></div><div id="yiv8681398192composer_signature"><div style="font-size:85%;color:#575757;">Sent from my Verizon Wireless 4G LTE smartphone</div></div><br clear="none"><br clear="none">-------- Original message --------<br clear="none">From: Cliff Redus via Personal_Submersibles <personal_submersibles@psubs.org> <br clear="none">Date: 2015/07/26 1:28 PM (GMT-08:00) <br clear="none">To: Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br clear="none">Subject: Re: [PSUBS-MAILIST] LED Lights <br clear="none"><br clear="none"><div class="qtdSeparateBR"><br><br></div><div class="yiv8681398192yqt6326399428" id="yiv8681398192yqt63439"><div dir="ltr"><div>For anyone that has a large LED or halogens on their boat, can you share your experience on narrow beam vs flood lights. Building a LED housing to be low profile to fit in a FRP recess is going to be difficult with a reflector to get a narrow beam. As an example, a typical reflector size for a Vero 29 is 110mm (4.33") diameter and 67mm (2.64") deep. This is massive and you still need housing and heat sink fins.</div><div><br clear="none"></div><div>I am wonder if we really need a focused light or is a flood light adequate?</div><div><br clear="none"></div><div>Cliff</div></div></div>
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