<div dir="ltr"><div>Alec, while I like concept of KISS in general, I am not sure you would be happy running this LED off a 36vdc bank without a driver due to the light lumens variation with voltage.</div><div><br></div><div> The light intensity and current are strong functions of the forward voltage. When the driving voltage drops from 38 to 35.1 vdc, the lumens drop from 10,590 to 2846(27%) and the current drops from 2.1 amps to 500mA. So as you start dropping the forward voltage the light get dimmer and dimmer. My guess is the below 35.1, it just continues to get dimmer and dimmer. We really need a LED driver like the one Ken specified that will hold a fixed current regardless of dropping supply voltage.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Jul 3, 2016 at 8:08 AM, Alec Smyth 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 dir="ltr">Hi Cliff,<div><br></div><div>You got the attention of Captain Quaker there, as I too am running a 36V bus and the simplest most rugged driver is no driver. Since my boat hasn't been in the water yet I don't know what voltage drop I'll see at hard throttle, but in my experience the lead foot only comes down on the surface where I don't particularly need dive lights. When dived, the thrusters are just ticking over. Do you know what would happen when the voltage falls below 35.1? If the lights just go a bit dimmer, that might be fine. If its a step function on the other hand and they just go out altogether, then obviously not so good. </div><div><br></div><div><br></div><div><br></div><div>Best,</div><div><br>Alec </div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Jul 2, 2016 at 4:50 PM, Cliff Redus 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:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid"><div dir="ltr"><div>Alan, my boat has the propulsion buss at 36VDC nominal and everything else on the 24VDC buss. My exterior lights run of the 36VDC buss. The voltage range for 36V buss is 30-40vdc, fully discharged to fully charged. If I Iook at the specs on the 10K Lumen Bridgelux, the driving voltage requirement is 35.1V to 40.4 V with 38V as nominal. So I could in theory run this LED array without any driver at all but every time I hit the throttle, the lights would dim. I need a constant current LED driver that holds the current to 2.1 amps. Like you I have been looking for OTS led drivers but have not been able to find one that meets the specs outlined in Ken M. spec and are small enough to fit in as tight enclosure.</div><span><font color="#888888"><div><br></div><div><br></div><div>Cliff</div></font></span></div><div><div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Jul 2, 2016 at 3:05 PM, Alan 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:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid"><div dir="auto"><div>Cliff,</div><div>what voltage are you running on your sub?</div><div>You can generally run these leds at a lower voltage & it is </div><div>beneficial to them. If you have a bench top power supply that goes to 36V, you can</div><div>slowly power up the led without a driver & check if it is bright enough at 36V. Don't</div><div>do this for more than a second or so or you may destroy the led. I am having a 48V </div><div>system, but the choices in electronics that are compatible, dramatically drops over a 36V system.</div><div>I have looked at just about every off the shelf led dc driver on the planet.</div><div>cheers Alan</div><div><br></div><div><br><br>Sent from my iPad</div><div><br>On 3/07/2016, at 7:03 am, Cliff Redus via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><div>This LED driver will not work for the 10K lumen Bridgelux LED as it needs 38V forward voltage , 2.1 amps and 80W. This driver can only get up to 36V.</div><div><br></div><div>Cliff</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Jul 1, 2016 at 11:39 PM, Alan James 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:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid"><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><span></span></div><div>Alec,</div><div>I have been working on a light housing. Have attached a dwg but it is not finalized.</div><div>I would have had it completed but have been waiting a Month on a replacement motor</div><div>for my lathe :(</div><div>I am using a square 50W LED, but you can get 60 & 80W LEDs the same size.</div><div>I am NOT putting the driver in the light housing, it ends up sitting at the back of the LED</div><div dir="ltr">where there is a massive amount of heat generated from these high power LEDs.</div><div dir="ltr">Keeping the driver in the hull makes it easy to change out if it fails. </div><div dir="ltr">I am going with an acrylic lens & oil compensated. I would have liked a borosilicate pressure</div><div dir="ltr">resistant lens but it was going to cost $100-+. Also if there is a leak with a pressure resistant</div><div dir="ltr">housing, electrolysis can pressurize it with hydrogen gas.</div><div dir="ltr">I am not using a reflector as they don't seem to do anything with these big LEDs. They are really</div><div dir="ltr">rows of little 1W LEDs,10X6 for a 60W. So you get light being emitted from either side of the inch</div><div dir="ltr">wide emitter, that is hard to control, especially when you are wanting an 80 degree wide angled</div><div dir="ltr">flood light.</div><div dir="ltr">My design also revolves around local stock aluminum tube sizes.</div><div dir="ltr">The LEDs are around 30 to 36V. I am using these as drivers. $4.64 US, not bad.</div><div dir="ltr">Alan</div><div dir="ltr"><a href="http://www.dx.com/p/5a-constant-current-led-driver-module-battery-charger-red-433947#.V3dE1bh96Uk" target="_blank">Constant Voltage Constant Current DC-DC Power Module for Arduino</a><br><br></div><div><br></div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;max-width:400px" dir="ltr"> <a style="color:rgb(0,0,0)!important;text-decoration:none!important" href="http://www.dx.com/p/5a-constant-current-led-driver-module-battery-charger-red-433947#.V3dE1bh96Uk" target="_blank" rel="noreferrer"> <table style="max-width:400px" border="0" cellspacing="0" cellpadding="0"> <tbody><tr> <td width="400"> <table width="100%" style="max-width:400px" border="0" cellspacing="0" cellpadding="0"> <tbody><tr> <td background="https://s.yimg.com/vv//api/res/1.2/3Gy3q6fb5RPODVCmFJEp0w--/YXBwaWQ9bWFpbDtmaT1maWxsO2g9MjAwO3c9NDAw/http://img.dxcdn.com/productimages/sku_433947_1.jpg.cf.jpg" valign="top" style="background: url("https://ci4.googleusercontent.com/proxy/vp3MB4PyucrbkudRQgMFwak4Cva9UgtQx7VyWhqv3B26pkOXMsoHeYeBNnZh7jjenj6oYTEAJAi8ASwFKEqfhiXqsQ1jC3quKZTh3V__-GwZNxCq93uLeGc_J3Uo4Ud2KriOZ0xRIozHW4AdehGWGXNH33nRErDW2k3shrNbC-2iPMckSZgtmYR4SqlmH-aipoODGrcXDggClsFkb4n050iAP61zbzIWzF0stl1Na-Quq4Kgxxw=s0-d-e1-ft#https://s.yimg.com/vv//api/res/1.2/3Gy3q6fb5RPODVCmFJEp0w--/YXBwaWQ9bWFpbDtmaT1maWxsO2g9MjAwO3c9NDAw/http://img.dxcdn.com/productimages/sku_433947_1.jpg.cf.jpg") no-repeat center / cover rgb(0, 0, 0); height: 200px;" bgcolor="#000000"> <table style="width:100%" border="0" cellspacing="0" cellpadding="0" valign="top"> <tbody><tr> <td background="https://s.yimg.com/nq/storm/assets/enhancrV2/12/overlay-tile.png" valign="top" style="background: url("https://ci6.googleusercontent.com/proxy/Or0PpNz8Q2N-T77lb2rdWKcTmD4Aucmk2Ee_LS8DyP6g6BDF3rwx4OyZl6lsUYsZqw8AQBiEM0n0IXQQ0XX4vUAoRYgzG6vu_JFg3P_OaiyHSXs0y-U=s0-d-e1-ft#https://s.yimg.com/nq/storm/assets/enhancrV2/12/overlay-tile.png") left top; height: 200px;" bgcolor="transparent"> <table height="185" style="width:100%;height:185px;min-height:185px"> <tbody><tr> <td style="padding:15px 0px 0px 15px;text-align:left;vertical-align:top"> <span style="color:rgb(255,255,255);font-size:18px;font-weight:bold"> $ 4.64 </span> </td> <td style="padding:15px 15px 0px 0px;text-align:right;vertical-align:top"> <div></div> </td> </tr> </tbody></table> </td> </tr> </tbody></table> </td> </tr> <tr> <td> <table align="center" style="background:rgb(255,255,255);border-width:1px 1px 3px;border-style:solid;border-color:rgb(224,228,233) rgb(224,228,233) rgb(0,0,0);width:95%;margin-right:auto;margin-left:auto;max-width:380px" border="0" cellspacing="0" cellpadding="0"> <tbody><tr> <td style="padding:16px 0px 16px 12px;vertical-align:top;background-color:rgb(255,255,255)"> </td> <td style="padding:16px 12px;width:99%;vertical-align:middle"> <h2 style="margin:0px 0px 4px;line-height:19px;font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:16px">Constant Voltage Constant Current DC-DC Power Module for Arduino</h2> <div style="color:rgb(153,153,153);line-height:15px;font-size:11px">I like this from DX. Find the cool gadgets at a incredibly low price with worldwide free shipping here.</div> </td> <td style="padding:16px 12px 16px 0px;text-align:right"> </td> </tr> </tbody></table> </td> </tr> </tbody></table> </td> </tr> </tbody></table> </a></div><div><br></div><div style="display:block"> <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"> <font face="Arial" size="2"> <hr size="1"> <b><span style="font-weight:bold">From:</span></b> Alec Smyth via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">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" target="_blank">personal_submersibles@psubs.org</a>> <br> <b><span style="font-weight:bold">Sent:</span></b> Saturday, July 2, 2016 1:41 PM<br> <b><span style="font-weight:bold">Subject:</span></b> [PSUBS-MAILIST] PSUBS light project status<br> </font> </div> <div><br><div><div dir="ltr">Hi gents,<div><br></div><div>I have an almost-ready sub but no lights, so was wondering whether to make them per the PSUBS-designed model in the community projects section of the website. I'm in awe of those drawings! However, they show a printed wiring board that is a placeholder for a part still to be designed. I was wondering if that might have happened, or if there might be an ETA? </div><div><br></div><div>Thanks,</div><div><br>Alec</div></div></div><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><br><br></div> </div> </div> </div></div></div><br>_______________________________________________<br>
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