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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Al,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>You are right.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Ken<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <b>On Behalf Of </b>Alan James via Personal_Submersibles<br><b>Sent:</b> Sunday, July 26, 2015 12:57 PM<br><b>To:</b> Personal Submersibles General Discussion <personal_submersibles@psubs.org><br><b>Subject:</b> Re: [PSUBS-MAILIST] LED Lights<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div id="yui_3_16_0_1_1437928322311_11930"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica",sans-serif;color:black'>Hi Al,<o:p></o:p></span></p></div><div id="yui_3_16_0_1_1437928322311_11930"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica",sans-serif;color:black'>I hadn't thought of that.<o:p></o:p></span></p></div><div id="yui_3_16_0_1_1437928322311_11930"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica",sans-serif;color:black'>Am trying to make a case for having the two brightness options & are thinking of ways <o:p></o:p></span></p></div><div id="yui_3_16_0_1_1437928322311_11930"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica",sans-serif;color:black'>that avoid the extra pin. <o:p></o:p></span></p></div><div id="yui_3_16_0_1_1437928322311_11930"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica",sans-serif;color:black'>Another option would be to have 24v as high beam & when the IC sees 36v the light goes to low<o:p></o:p></span></p></div><div id="yui_3_16_0_1_1437928322311_11930"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica",sans-serif;color:black'>beam. So those with the 24v would only have the one option.<o:p></o:p></span></p></div><div id="yui_3_16_0_1_1437928322311_11930"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica",sans-serif;color:black'>I have several flash lights that cycle through their various modes. This could be another way of<o:p></o:p></span></p></div><div id="yui_3_16_0_1_1437928322311_11930"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica",sans-serif;color:black'>changing between high & low beam; swith the light off & on again & it goes to the next mode.<o:p></o:p></span></p></div><div id="yui_3_16_0_1_1437928322311_11930"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica",sans-serif;color:black'>Alan<o:p></o:p></span></p></div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica",sans-serif;color:black'><o:p> </o:p></span></p><div id="yui_3_16_0_1_1437928322311_12851"><div id="yui_3_16_0_1_1437928322311_12850"><div id="yui_3_16_0_1_1437928322311_12849"><div class=MsoNormal align=center style='text-align:center;background:white'><span style='font-family:"Helvetica",sans-serif;color:black'><hr size=1 width="100%" align=center></span></div><p class=MsoNormal style='background:white'><b><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>From:</span></b><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'> Al Secor via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br><b>To:</b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br><b>Sent:</b> Monday, July 27, 2015 4:35 AM<br><b>Subject:</b> Re: [PSUBS-MAILIST] LED Lights</span><span style='font-family:"Helvetica",sans-serif;color:black'><o:p></o:p></span></p></div><div id="yui_3_16_0_1_1437928322311_13843"><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='font-family:"Helvetica",sans-serif;color:black'><br>Alan,<br><br>But then you would be excluding those with only a 24v system from using the max output...I assume the wide voltage input spec is to satisfy both<br>voltage systems.<br><br>Al Secor<br><br>--------------------------------------------<br>On Sun, 7/26/15, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br>Subject: Re: [PSUBS-MAILIST] LED Lights<br>To: "Personal Submersibles General Discussion" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>Date: Sunday, July 26, 2015, 11:57 AM<br><br>Ken,you<br>are saying the LED operates from 21 to 45<br>volts.If we had a switch that switched between 24<br>& 36 volts in the hull,& an IC that<br>detected the difference in the light housing,then<br>we wouldn't need an extra wire / pin to initiate a<br>changefrom 5000 to 10000 lumens.cheers<br>Alan<br><br>Sent from my<br>iPad<br>On<br>27/07/2015, at 1:39 am, Ken Martindale via<br>Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>wrote:<br><br>#yiv3279730652<br>#yiv3279730652 --<br> <br> _filtered #yiv3279730652 {panose-1:2 4 5 3 5 4 6 3 2 4;}<br> _filtered #yiv3279730652 {font-family:Calibri;panose-1:2 15<br>5 2 2 2 4 3 2 4;}<br> _filtered #yiv3279730652 {font-family:Consolas;panose-1:2<br>11 6 9 2 2 4 3 2 4;}<br> _filtered #yiv3279730652 {panose-1:2 11 5 2 4 2 4 2 2 3;}<br>#yiv3279730652 <br>#yiv3279730652 p.yiv3279730652MsoNormal, #yiv3279730652<br>li.yiv3279730652MsoNormal, #yiv3279730652<br>div.yiv3279730652MsoNormal<br> {margin:0in;margin-bottom:.0001pt;font-size:12.0pt;}<br>#yiv3279730652 a:link, #yiv3279730652<br>span.yiv3279730652MsoHyperlink<br> {color:blue;text-decoration:underline;}<br>#yiv3279730652 a:visited, #yiv3279730652<br>span.yiv3279730652MsoHyperlinkFollowed<br> {color:purple;text-decoration:underline;}<br>#yiv3279730652 p<br> {margin-right:0in;margin-left:0in;font-size:12.0pt;}<br>#yiv3279730652 pre<br> {margin:0in;margin-bottom:.0001pt;font-size:10.0pt;}<br>#yiv3279730652 p.yiv3279730652msoacetate, #yiv3279730652<br>li.yiv3279730652msoacetate, #yiv3279730652<br>div.yiv3279730652msoacetate<br> {margin-right:0in;margin-left:0in;font-size:12.0pt;}<br>#yiv3279730652 p.yiv3279730652msonormal, #yiv3279730652<br>li.yiv3279730652msonormal, #yiv3279730652<br>div.yiv3279730652msonormal<br> {margin-right:0in;margin-left:0in;font-size:12.0pt;}<br>#yiv3279730652 p.yiv3279730652msochpdefault, #yiv3279730652<br>li.yiv3279730652msochpdefault, #yiv3279730652<br>div.yiv3279730652msochpdefault<br> {margin-right:0in;margin-left:0in;font-size:12.0pt;}<br>#yiv3279730652 p.yiv3279730652msonormal1, #yiv3279730652<br>li.yiv3279730652msonormal1, #yiv3279730652<br>div.yiv3279730652msonormal1<br> {margin:0in;margin-bottom:.0001pt;font-size:12.0pt;}<br>#yiv3279730652 p.yiv3279730652msoacetate1, #yiv3279730652<br>li.yiv3279730652msoacetate1, #yiv3279730652<br>div.yiv3279730652msoacetate1<br> {margin:0in;margin-bottom:.0001pt;font-size:8.0pt;}<br>#yiv3279730652 p.yiv3279730652msochpdefault1, #yiv3279730652<br>li.yiv3279730652msochpdefault1, #yiv3279730652<br>div.yiv3279730652msochpdefault1<br> {margin-right:0in;margin-left:0in;font-size:10.0pt;}<br>#yiv3279730652 span.yiv3279730652msohyperlink<br> {}<br>#yiv3279730652 span.yiv3279730652msohyperlinkfollowed<br> {}<br>#yiv3279730652 span.yiv3279730652emailstyle19<br> {}<br>#yiv3279730652 span.yiv3279730652emailstyle20<br> {}<br>#yiv3279730652 span.yiv3279730652emailstyle21<br> {}<br>#yiv3279730652 span.yiv3279730652msohyperlink1<br> {color:blue;text-decoration:underline;}<br>#yiv3279730652 span.yiv3279730652msohyperlinkfollowed1<br> {color:purple;text-decoration:underline;}<br>#yiv3279730652 span.yiv3279730652emailstyle191<br> {color:#1F497D;}<br>#yiv3279730652 span.yiv3279730652emailstyle201<br> {color:#1F497D;}<br>#yiv3279730652 span.yiv3279730652emailstyle211<br> {color:#1F497D;}<br>#yiv3279730652 span.yiv3279730652EmailStyle33<br> {color:#1F497D;}<br>#yiv3279730652 p.yiv3279730652msonor, #yiv3279730652<br>li.yiv3279730652msonor, #yiv3279730652<br>div.yiv3279730652msonor<br> {margin-right:0in;margin-left:0in;font-size:12.0pt;}<br>#yiv3279730652 p.yiv3279730652mson, #yiv3279730652<br>li.yiv3279730652mson, #yiv3279730652 div.yiv3279730652mson<br> {margin-right:0in;margin-left:0in;font-size:12.0pt;}<br>#yiv3279730652 span.yiv3279730652HTMLPreformattedChar<br> {}<br>#yiv3279730652 span.yiv3279730652EmailStyle39<br> {color:#1F497D;}<br>#yiv3279730652 .yiv3279730652MsoChpDefault<br> {font-size:10.0pt;}<br> _filtered #yiv3279730652 {margin:1.0in 1.0in 1.0in 1.0in;}<br>#yiv3279730652 div.yiv3279730652WordSection1<br> {}<br>#yiv3279730652 Sean, There will not be any change in<br>the LED intensity as long as the input voltage is between<br>21.6 volts and 45 volts. We will tightly regulate the<br>current into the LED array. Noise on the power input may not<br>be a problem within certain limits since the input EMI<br>filter will handle a fair amount of noise. If your slip rings break the power<br>flow the light will continue to operate for about 3 to 8<br>milliseconds or less. It won’t be damaged or degraded.<br>Might get some interesting current surges<br>though. Can’t make a statement about the<br>commercial drivers since some of them are low quality (they<br>still mostly work). Ken From: Personal_Submersibles [mailto:<a href="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles-bounces@psubs.org</a>]<br>On Behalf Of Sean T. Stevenson via<br>Personal_Submersibles<br>Sent: Sunday,<br>July 26, 2015 8:52 AM<br>To: Personal<br>Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] LED<br>Lights How sensitive are<br>LED drivers to supply voltage stability? If I were to, for<br>example, feed the LED light with 24 VDC that must first pass<br>through a set of electrical slip rings, would any<br>fluctuation in resistance or momentary interruption to the<br>supply harm the light?Sean On July 26, 2015 6:38:23 AM<br>MDT, Ken Martindale via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>wrote:Basically that’s the same<br>for this light except it will shut off until it cools down,<br>take a look at the spec. Ken From:<br>Personal_Submersibles [mailto:<a href="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles-bounces@psubs.org</a>]<br>On B! ehalf Of Alan James via<br>Personal_Submersibles<br>Sent: Saturday,<br>July 25, 2015 9:21 PM<br>To: Personal<br>Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] LED<br>Lights Thanks for that info<br>Hugh.This extract from a manual below,<br>is for a 700lm light. So heating as you say will be a big<br>issue.How<br>hard is thermal rollback Ken???..... <br>General Notes and Warnings The Nano SeaLite can be run in<br>air, but will go into thermal rollback, where its light<br>output diminishes to protect the light from overheating.<br>This is normal and purposely designed to protect the LEDs<br>from being damaged by excess heat buildup while running in<br>air. The light will return to full brightness once it is<br>submerged in water or it’s allowed to cool down. This<br>thermal rollback will not happen when light is being<br>operated in water under normal usage. WARNING When the Nano<br>SeaLite is operated in air the body may reach temperatures<br>in excess of 65° C. These temperatures may be enough to<br>cause burns if the light is handled without protective<br>clothing.Alan From: Hugh Fulton via<br>Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>To: 'Personal Submersibles General<br>Discussion' <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br><br>Sent: Sunday, July 26, 2015 12:34<br>PM<br>Subject: Re: [PSUBS-MAILIST] LED<br>Lights 40<br>degrees gives you 30 degrees120<br>degrees! gives you 80 degreesIt<br>doesn’t matter whether acrylic, Glass or borosilicate with<br>flat planes.The<br>only reservation on my lights is that I have not done a lens<br>for the seawater to optimise angles etc. Also my reflector<br>is round with a square LED.Looks great in the swimming pool<br>at night but as I haven’t dived it I have no experience as<br>to how it will look in the sea. <br>With a really compact light and 94 watts of heat it is not<br>going to last long in the air. It will need serious<br>fins. Needs to be idiot proof.One<br>thing is that it needs to have automatic dimming reduction<br>for temperature so it does not desolder or destroy O</span><span style='font-family:"Segoe UI Symbol",sans-serif;color:black'>⡍</span><span style='font-family:"Helvetica",sans-serif;color:black'> rings etc.I<br>will try and work out how the forum works and go to that. <br>I could not get into it but could view it. Hugh From: Personal_Submersibles<br>[mailto:<a href="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles-bounces@psubs.org</a>]<br>On Behalf Of Ken Martindale via<br>Personal_Submersibles<br>Sent: Sunday,<br>26 July 2015 11:58 a.m.<br>To:<br>'Personal Submersibles General Discussion'<br>Subject: Re: [PSUBS-MAILIST] LED<br>Lights PS<br>We are supposed to be discussing the LED light on the<br>forum? ken From: Personal_Submersibles<br>[mailto:<a href="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles-bounces@psubs.org</a>]<br>On Behalf Of Hugh Fulton via Personal_Submersibles<br>Sent:<br>Saturday, July 25, 2015 7:33 PM<br>To:<br>'Personal Submersibles General Discussion' <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] LED<br>Lights Re-<br>Dimming.Would it not be better to have 2<br>switchable intensities rather than variable. Then you can<br>have a 3 position switch. Is it simpler?Hugh From: Personal_Submersibles<br>[mailto:<a href="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles-bounces@psubs.org</a>]<br>On Behalf Of Cliff Redus via Personal_Submersibles<br>Sent: Sunday, 26 July 2015 8:20 a.m.<br>To: Personal Submersibles General<br>Discussion<br>Subject: Re:<br>[PSUBS-MAILIST] LED Lights Yes<br>we did but we had two members that were pushing hard for<br>dimming. From feedback, we were two for and two against. <br> I would prefer not have it but if it makes the lite more<br>generally accepted, I am willing to incorporate it. This<br>last version of suggestions are just that, suggestions. A<br>understand that nothing is frozen and we still do not have<br>final consensus. Cliff On<br>Sat, Jul 25, 2015 at 3:13 PM, Ken Martindale via<br>Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>wrote:Cliff, Dimming, I thought we deleted<br>this?Ken From: Personal_Submersibles<br>[mailto:<a href="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles-bounces@psubs.org</a>]<br>On Behalf Of Cliff Redus via Personal_Submersibles<br>Sent: Saturday! , July 25, 2015 3:29<br>PM<br>To: Personal Submersibles General<br>Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] LED<br>Lights Ken, I took you latest pass on<br>spec and generated a one page summary.<br> Cliff On<br>Sat, Jul 25, 2015 at 9:48 AM, Ken Martindale via<br>Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>wrote:This light will require<br>substantial cooling! . Total dissipation is about 94<br>watts. Puts out a lot of light.<br> Ken From: Personal_Submersibles<br>[mailto:<a href="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles-bounces@psubs.org</a>]<br>On Behalf Of Cliff Redus via Personal_Submersibles<br>Sent: Saturday, July 25, 2015 10:18<br>AM<br>To: Personal Submersibles General<br>Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-M! AILIST] LED<br>Lights Alan, my thinking is that with the<br>flange, you could mount the light either way. On the new<br>boat I am designing, I am planning a FRP recess so that<br>outside of the flange is flush with the outside of the FRP<br>shell. Would still need to cut a hole were the body passes<br>through the FRP shell. Yes this does reduce the convection<br>heat transfer from the light but I was thinking of leaving<br>say a 3/8 clearance around the recessed flange. I<br>don't see any problem with either approach to sealing on<br>a MPB by using a neoprene flat<br>gadget. Cliff On<br>Fri, Jul 24, 2015 at 3:58 PM, Alan James via<br>Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>wrote:Cliff,I<br>was thinking of fitting the light in to a bowl<br>shapedrecess in the fairing / ballast<br>tank, whereas you were proposingcutting a hole out & fitting<br>it in. In hindsight your idea is<br>betterbecause my idea would inhibit the<br>heat dispersion due to the<br>fiberglasssurrounding the light<br>fitting.Alan From: Cliff Redus via<br>Personal_Submersibles &! lt;<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>To: Personal Submersibles General<br>Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br><br>Sent: Saturday, July 25, 2015 8:43<br>AM<br>Subject: Re: [PSUBS-MAILIST] LED<br>Lights Alan, I am visual kind of guy. <br>Can send me sketch of what you are describing and we can<br>talk. Cliff On<br>Fri, Jul 24, 2015 at 3:23 PM, Alan James via<br>Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>wrote: Looks a good solid light<br>Cliff.On<br>looking at the perpendicular cable entry, I was thinking<br>weneed a back entry for the purposes<br>of mounting in to a housingin<br>the fairing as you have requested in your<br>list.I<br>am looking at mounting in to ballast tanks so will create<br>the shape of<br>the light in the molding to receive it. If there was a<br>threadedextension on the back of the light<br>it could slot through a hole & be<br>securedwith a nut. This would make it<br>easier to seal off the ballast tanks<br>inmy<br>situation.Alan From: Cliff Redus via<br>Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>To: Personal Submersibles General<br>Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br><br>Sent: Saturday, July 25, 2015 1:55<br>AM<br>Subject: Re: [PSUBS-MAILIST] LED<br>Lights Ken, if you go to Youtube and do a<br>search on <a href="https://youtu.be/D7VnwODU7vk">https://youtu.be/D7VnwODU7vk</a>,<br>or 5000 Lumen Bridgelux Vero 18 LED light, you will see a<br>short video of the light. Cliff On<br>Thu, Jul 23, 2015 at 3:29 PM, Ken Martindale via<br>Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>wrote: Cliff, How<br>do I look at them?? Ken From: Personal_Submersibles<br>[mailto:<a href="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles-bounces@psubs.org</a>]<br>On Behalf Of Clifford Redus via<br>Personal_Submersibles<br>Sent: Thursday,<br>July 23, 2015 4:18 PM<br>To: Personal<br>Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] LED<br>Lights Now<br>that Jon has the forum site set up for the LED light<br>project, my suggestion is to move the discussion to the<br>forum site called out in Jon's email. BTW, I have<br>uploaded to the site the wiring diagram and housing drawings<br>for the 5000 Lumen light that was designed by the ME<br>students I was mentoring last<br>year. Cliff On<br>Thu, Jul 23, 2015 at 2:55 PM, Ken Martindale via<br>Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>wrote:Doing the dimming electrically is<br>easy but the problem is the extra wiring and where do you<br>mount the Potentiometer? We can<br>include the wires in the cable for use as an option this<br>also complicates the cabling. Instead of two wires we would<br>require 4 wires. Personally I also like the dimming<br>since it will extend the time you can use it out of the<br>water. Anybody also like or dislike? Cliff would like to<br>delete. You<br>guys! be sure to keep reading the spec. it will have almost<br>daily updates for a while. Ken From: Personal_Submersibles<br>[mailto:<a href="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles-bounces@psubs.org</a>]<br>On Behalf Of Alan James via Personal_Submersibles<br>Sent: Thursday, July 23, 2015 3:31 PM<br>To: Personal Submersibles General<br>Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] LED<br>Lights Cliff,<br>Ken,I<br>like the dimming option. The 10,000 lumens may be too much<br>light insome low visibility conditions<br>where there is a lot of back<br>scatter.The<br>5,000 lumen option may act like a fog<br>light.Also I am thinking of having<br>lights mounted to the side which may<br>notneed to be as<br>intense.Depth rating.... looking at the<br>drawings of various 10,000 meter light<br>housings,it<br>seems simple to achieve a reasonable depth without much more<br>cost.Potting the board..... I would be<br>careful about what was potted in case some of<br>thecomponents needed to get rid of a<br>bit of heat.Mechanical housing..... ! with you<br>on that one Cliff. Like the idea of the recessed<br>light.Alan From: Clifford Redus via<br>Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>To: Person! al Submersibles General<br>Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br><br>Sent: Friday, July 24, 2015 4:06<br>AM<br>Subject: Re: [PSUBS-MAILIST] LED<br>Lights Ken, good first pass at the<br>specs. Below are comments. BTW, I will post these here<br>as I have not been able to get the activation code back yet<br>on registering at the<br>forum. Item 2.1 DC Voltage. If it were<br>me, I would stick with nominal battery bank voltages of 24<br>and 36 VDC. When I switch to MK 101 thrusters, I dropped<br>my main battery bank voltage to 36VDC my instrumentation bus<br>is 24VDC. Would need a single fuse holder to accept<br>fuses to handle different nominal<br>voltages. Item 4.0 Depth Requirement. In<br>the spirit of keeping cost down, I think 500 meters (1640<br>ft) would be more than enough. I know Scott is designing a<br>deep diving boat but is any one else shooting for more than<br>500m? 6.0<br>Dimming. I would omit the ability to dim the light. <br>Yes I know it is easy from an electrical point of view but<br>it forces us to go with more pins on the subsea connector. <br>I am thinking on installing multiple lighs so I could just<br>control on/off for each light. I could go either way on<br>this but in the spirit of KISS, I vote to omit<br>dimming. 8.3<br>Ports I would change plastic to acrylic. I don't<br>think we will end up here but if we do, we can use PVHO flat<br>view port calcs to size the acrylic<br>lens. 9.0<br>Printed Wiring Boards. I really like the way the Minn-Kota<br>motor controller PWBs are potted. Rather than using the<br>spray on hydrophobic coatings, to me we should pot the board<br>(accept for access to fuse). Therefore suggest changing<br>the word coated to<br>potted. 11.0 Mechanical Housing. I<br>suggest. The LED panel light and PCB shall be contained<br>in a single 1-atm flange mounted cylindrical housing with<br>a low profile that can be recessed in a FRP shell with<br>attachment screws from the rear of the flange. The housing<br>should contain a single 29 LED Array rated at 10,000<br>lumens with a rated power of 91-140<br>lumens/W (109-71W). Mounting holes will be provided for<br>an optional SS yoke style support bracket. <br> Material: Hard anodized 6061-T6 or<br>7071-T6 TBD (I have a grey beard machinist friend that<br>owns a machine shop. He loves 7071-T6 as it is a dream to<br>machine and stronger than<br>6061-T6. On<br>Thu, Jul 23, 2015 at 9:52 AM, Ken Martindale via<br>Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>wrote: Cost is critical. The electronics<br>should be a small part of the cost. The housing might be the<br>most expensive. Hope you guys are reading the<br>specification. Ken From: Personal_Submersibles<br>[mailto:<a href="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles-bounces@psubs.org</a>]<br>On Behalf Of Clifford Redus via<br>Personal_Submersibles<br>Sent: Thursday,<br>July 23, 2! 015 10:18 AM<br>To: Personal<br>Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] LED<br>Lights Jon, thanks for setting up the<br>forum. I am assuming we can post files as<br>well. &nb! sp;I agree low cost is<br>important but having a functioning light is as well. OTS<br>LED utility lights like that one you noted are not an option<br>unless they can be potted. To me the best way to keep the<br>cost low, is to publish construction drawings of a 1-atm<br> DIY housing that a psubber could machine or have machined<br>by a friend, and publish a design of a PCB that could be<br>easily fabricated using one of the PCB online sites like<br> ExperessPCB <a href="http://www.expresspcb.com">www.expresspcb.com</a> and<br>DIY populate the board. As a group, we design and build a<br>prototype that I can test in my shop. If it works as<br>designed, then we post to the psubs site a report, that<br>includes the design drawings, circuit diagram, parts list<br>and test<br>results. Getting a consciences on the<br>design spec is the first<br>step. Cliff On<br>Wed, Jul 22, 2015 at 10:11 PM, Jon Wallace via<br>Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>wrote:<br>My three words of advice...cost, cost, cost.<br><br>One measure of a success for<br>this project will be how many people actually build/use<br>it. If it costs more to manufacture than just purchasing<br>something like <a href="http://www.surpluscenter.com/Electrical/Lights/DC-Mobile-Equipment-Lights/12-24-VDC-3120-LUMEN-16-LED-UTILITY-FLOOD-LIGHT-12-999-B.axd" target="_blank">http://www.surpluscenter.com/Electrical/Lights/DC-Mobile-Equipment-Lights/12-24-VDC-3120-LUMEN-16-LED-UTILITY-FLOOD-LIGHT-12-999-B.axd</a><br>off the shelf then it's real world application by<br>psubbers may be limited.<br><br>Over-spec'ing the design above requirements<br>for typical recreational operations (ie 10,000 psi<br>capability) is likely going to drive up the cost. Also,<br>let's remember that "cheap", "low<br>cost", and "good price" are relative terms<br>for a diverse group like PSUBS so include realistic<br>estimates of parts and manufacturing especially if tooling<br>is required.<br><br>Jon<br><br>_______________________________________________<br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles%C2%A0" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles </a><br>_______________________________________________<br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles%C2%A0%C2%A0_______________________________________________" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles 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