<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_1441230333437_8980"><span id="yui_3_16_0_1_1441230333437_8979">Ken,</span></div><div dir="ltr" id="yui_3_16_0_1_1441230333437_8978"><span id="yui_3_16_0_1_1441230333437_8977">it may be worth looking at whether we design this light with the driver in the hull.</span></div><div dir="ltr" id="yui_3_16_0_1_1441230333437_8971"><span id="yui_3_16_0_1_1441230333437_8972">I have covered this in another email, but additionally, the commercial standing</span></div><div dir="ltr" id="yui_3_16_0_1_1441230333437_8970"><span id="yui_3_16_0_1_1441230333437_8969">lamp I saw, that was using the latest 100W LED array had alluminium heat sinks</span></div><div dir="ltr" id="yui_3_16_0_1_1441230333437_8970"><span id="yui_3_16_0_1_1441230333437_9250">about 3" long & about 10 of them, out the back. So heat will be a big problem.</span></div><div dir="ltr" id="yui_3_16_0_1_1441230333437_8970"><span id="yui_3_16_0_1_1441230333437_9516">If we keep the driver in the hull it won't get cooked, & we can heat sink the emitter</span></div><div dir="ltr" id="yui_3_16_0_1_1441230333437_8970"><span id="yui_3_16_0_1_1441230333437_9515">straight to the back of the housing where it will be cooled by water.</span></div><div dir="ltr" id="yui_3_16_0_1_1441230333437_8970"><span>Alan</span></div><div dir="ltr" id="yui_3_16_0_1_1441230333437_8970"><span><br></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_1441230333437_8676"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1441230333437_8675"> <div dir="ltr" id="yui_3_16_0_1_1441230333437_8694"> <hr size="1" id="yui_3_16_0_1_1441230333437_8981"> <font size="2" face="Arial" id="yui_3_16_0_1_1441230333437_8693"> <b id="yui_3_16_0_1_1441230333437_8968"><span style="font-weight:bold;" id="yui_3_16_0_1_1441230333437_8967">From:</span></b> Ken Martindale 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> Thursday, September 3, 2015 9:54 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Light lense<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1441230333437_8674"><br><div id="yiv7752138914"><style>#yiv7752138914 #yiv7752138914 --
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#yiv7752138914 </style><div id="yui_3_16_0_1_1441230333437_8673"><div class="yiv7752138914WordSection1" id="yui_3_16_0_1_1441230333437_8672"><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_8935"><span style="font-size:11.0pt;" id="yui_3_16_0_1_1441230333437_8934">Alan,</span></div><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_8700"><span style="font-size:11.0pt;"> </span></div><div class="yiv7752138914MsoNormal"><span style="font-size:11.0pt;">Usually if the driver is a true current source the extra wire doesn’t make much difference (within reason).</span></div><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_8671"><span style="font-size:11.0pt;"> </span></div><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_8678"><span style="font-size:11.0pt;" id="yui_3_16_0_1_1441230333437_8677">Also most drivers filter the switching waveform so the current to the LED is mostly a dc tern with a very low AC component.</span></div><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_8957"><span style="font-size:11.0pt;"> </span></div><div class="yiv7752138914MsoNormal"><span style="font-size:11.0pt;">Take a look at the design we have on the forum tomorrow late to see what the present design is.</span></div><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_9517"><span style="font-size:11.0pt;"> </span></div><div class="yiv7752138914MsoNormal"><span style="font-size:11.0pt;">Ken</span></div><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_8933"><span style="font-size:11.0pt;"> </span></div><div class="yiv7752138914MsoNormal"><span style="font-size:11.0pt;"> </span></div><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_8917"><span style="font-size:11.0pt;"> </span></div><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_8918"><span style="font-size:11.0pt;"> </span></div><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_8919"><span style="font-size:11.0pt;"> </span></div><div class="qtdSeparateBR"><br><br></div><div class="yiv7752138914yqt4850753822" id="yiv7752138914yqt61229"><div id="yui_3_16_0_1_1441230333437_8704"><div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in;" id="yui_3_16_0_1_1441230333437_8703"><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_8702"><b id="yui_3_16_0_1_1441230333437_9519"><span style="font-size:11.0pt;" id="yui_3_16_0_1_1441230333437_9518">From:</span></b><span style="font-size:11.0pt;" id="yui_3_16_0_1_1441230333437_8701"> Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <b id="yui_3_16_0_1_1441230333437_8920">On Behalf Of </b>Alan via Personal_Submersibles<br clear="none"><b id="yui_3_16_0_1_1441230333437_9520">Sent:</b> Monday, August 31, 2015 8:49 PM<br clear="none"><b>To:</b> Personal Submersibles General Discussion <personal_submersibles@psubs.org><br clear="none"><b id="yui_3_16_0_1_1441230333437_8932">Subject:</b> Re: [PSUBS-MAILIST] Light lense</span></div></div></div><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_8921"> </div><div id="yui_3_16_0_1_1441230333437_8931"><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_8930">Hank, that's a good question for Ken.</div></div><div id="yui_3_16_0_1_1441230333437_8923"><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_8922">As I understand it, the LED drivers have a switching frequency so are turning on & off</div></div><div id="yui_3_16_0_1_1441230333437_8929"><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_8928">the power to the LED. When electricity runs through wire it creates a magnetic field &</div></div><div id="yui_3_16_0_1_1441230333437_8925"><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_8924">when the power is switched off, the magnetic field collapses & causes a surge of electricity.</div></div><div id="yui_3_16_0_1_1441230333437_8927"><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_8926">Like a coil in a car creating a spark across a spark plug. The LED doesn't like this. </div></div><div id="yui_3_16_0_1_1441230333437_9522"><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_9521">The longer the run of wire, the more inductance is created. The capacitor is a buffer for this</div></div><div id="yui_3_16_0_1_1441230333437_9524"><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_9523">& there are big ones on high power LED drivers. They are there to combat the inductance from </div></div><div id="yui_3_16_0_1_1441230333437_8959"><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_8958">the battery to the driver, but by lengthening the wiring from driver to LED you create the </div></div><div id="yui_3_16_0_1_1441230333437_8956"><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_8955">problem out the other side. Perhaps a capacitor could be placed in the light fitting, & the</div></div><div><div class="yiv7752138914MsoNormal">driver in the pressure hull. This would reduce the footprint inside the fitting & stop the rest of the electronics from being exposed to any heat build up. you would still have the problem</div></div><div id="yui_3_16_0_1_1441230333437_8706"><div class="yiv7752138914MsoNormal" id="yui_3_16_0_1_1441230333437_8705">of pressure on the capacitor if you compensated though. Have seen pressure resistant</div></div><div><div class="yiv7752138914MsoNormal">capacitors, but don't know enough about them.</div></div><div><div class="yiv7752138914MsoNormal">I will go & see a friend who is an expert on this.</div></div><div><div class="yiv7752138914MsoNormal">Alan</div></div><div><div class="yiv7752138914MsoNormal"><br clear="none">Sent from my iPad</div></div><div><div class="yiv7752138914MsoNormal" style="margin-bottom:12.0pt;"><br clear="none">On 1/09/2015, at 11:20 am, hank pronk via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:</div></div><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt;"><div><div><div id="yiv7752138914yui_3_16_0_1_1441063212688_3129"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="font-size:9.0pt;">Alan,v</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441063212688_3129"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="font-size:9.0pt;">Why can't the driver stay inside the submarine, why put it in the housing?</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441063212688_3129"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="font-size:9.0pt;">Hank</span></div></div><div class="yiv7752138914MsoNormal" style="background:white;"><span style="font-size:9.0pt;"> </span></div><div><div class="yiv7752138914MsoNormal" style="margin-bottom:12.0pt;background:white;"><span style="font-size:9.0pt;"> </span></div></div><div><div><div><div><div class="yiv7752138914MsoNormal" style="background:white;"><span style="font-size:10.0pt;">On Monday, August 31, 2015 4:55 PM, Alan James via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:</span><span style=""></span></div></div><div class="yiv7752138914MsoNormal" style="margin-bottom:12.0pt;background:white;"><span style=""> </span></div><div><div id="yiv7752138914"><div><div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14459"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">Hank,</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14459"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">you have got me thinking. I don't want to pressure compensate because of the capacitors</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14459"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">in the driver. I was also concerned that any fluid might yellow with the heat.</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14459"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">According to this article, the main problem with LED lights is disipating the heat that comes</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14459"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">out the back of the emmitter.</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14459"><div class="yiv7752138914MsoNormal" style="background:white;"><span style=""><a rel="nofollow" shape="rect" target="_blank" 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 clear="none"><br clear="none"></span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14459"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">I could seal off the driver compartment at the back of the emmitter & fill that with oil. However</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14459"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">I will be machining this out of alluminium rod & can keep the enclosure round the driver pretty small</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14459"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">so there isn't much of an air gap to the housing.</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14459"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">Could easily experiment with & without oil to see if it makes much difference.</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14459"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">Alan</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14459"><div class="yiv7752138914MsoNormal" style="background:white;"><span style=""> </span></div></div><div class="yiv7752138914MsoNormal" style="background:white;"><span style=""> </span></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14407"><div id="yiv7752138914yui_3_16_0_1_1441057154792_14406"><div id="yiv7752138914yqt70729"><div id="yiv7752138914yui_3_16_0_1_1441057154792_14405"><div align="center" class="yiv7752138914MsoNormal" style="text-align:center;background:white;"><span style=""></span><hr align="center" size="1" width="100%"></div><div class="yiv7752138914MsoNormal" style="background:white;"><b id="yiv7752138914yui_3_16_0_1_1441057154792_18510"><span style="font-size:10.0pt;">From:</span></b><span style="font-size:10.0pt;"> hank pronk via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"><b id="yiv7752138914yui_3_16_0_1_1441057154792_18508">To:</b> Personal Submersibles General Discussion <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br clear="none"><b>Sent:</b> Tuesday, September 1, 2015 10:09 AM<br clear="none"><b>Subject:</b> Re: [PSUBS-MAILIST] Light lense</span><span style=""></span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14408"><div class="yiv7752138914MsoNormal" style="background:white;"><span style=""> </span></div><div id="yiv7752138914"><div id="yiv7752138914yui_3_16_0_1_1441057154792_14424"><div id="yiv7752138914yui_3_16_0_1_1441057154792_14423"><div id="yiv7752138914yui_3_16_0_1_1441058852894_3152"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="font-size:9.0pt;">Alan,</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441058852894_3152"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="font-size:9.0pt;">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><div id="yiv7752138914yui_3_16_0_1_1441058852894_3152"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="font-size:9.0pt;">Hank</span></div></div><div class="yiv7752138914MsoNormal" style="background:white;"><span style="font-size:9.0pt;"> </span></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14446"><div class="yiv7752138914MsoNormal" style="margin-bottom:12.0pt;background:white;"><span style="font-size:9.0pt;"> </span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14429"><div id="yiv7752138914yui_3_16_0_1_1441057154792_14428"><div id="yiv7752138914yui_3_16_0_1_1441057154792_14427"><div><div class="yiv7752138914MsoNormal" style="margin-bottom:12.0pt;background:white;"><span style=""> </span></div></div><div id="yiv7752138914yqt01305"><div id="yiv7752138914yui_3_16_0_1_1441057154792_14426"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="font-size:10.0pt;">On Monday, August 31, 2015 4:00 PM, Alan via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:</span><span style=""></span></div></div><div class="yiv7752138914MsoNormal" style="margin-bottom:12.0pt;background:white;"><span style=""> </span></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14432"><div id="yiv7752138914"><div id="yiv7752138914yui_3_16_0_1_1441057154792_14431"><div id="yiv7752138914yui_3_16_0_1_1441057154792_14448"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">Sorry part 2 ( ipad & big fingers)</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14430"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">The LED cost $11- & the driver $6-. Free delivery.</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14433"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">I have ordered a number of reflectors for a couple of dollars each.</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14434"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">The driver is quite small. With the automated assembly processes</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14435"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">& micro sized components, you can't get anywhere near this size</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14436"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">soldering on the components yourself.</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14478"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">Because of the heat factor I am limiting myself to the 6000lm LED.</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14437"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">Will be looking at the beam angle I get from these reflectors & available glass </span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14438"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">lenses, before making up a housing. Looking for a borosilicate lense</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14444"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">because of the heat transfer & low expansion.</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14439"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">I have taken a different route from Ken, but this process he started has</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14449"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">been very helpful & motivating, as has been the discussion & information</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14440"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">that has come out. </span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14443"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">Alan</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14441"><div class="yiv7752138914MsoNormal" style="background:white;"><span style=""><br clear="none"><br clear="none">Sent from my iPad</span></div></div><div id="yiv7752138914yqt41182"><div id="yiv7752138914yui_3_16_0_1_1441057154792_14442"><div class="yiv7752138914MsoNormal" style="margin-bottom:12.0pt;background:white;"><span style=""><br clear="none">On 1/09/2015, at 9:42 am, Alan <<a rel="nofollow" shape="rect" id="yiv7752138914yui_3_16_0_1_1441057154792_17450" ymailto="mailto:alanlindsayjames@yahoo.com" target="_blank" href="mailto:alanlindsayjames@yahoo.com">alanlindsayjames@yahoo.com</a>> wrote:</span></div></div></div></div><div id="yiv7752138914yqt87757"><div id="yiv7752138914yui_3_16_0_1_1441057154792_14451"><div id="yiv7752138914yui_3_16_0_1_1441057154792_14450"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">I bought a 24-36V 6000 lm & 4000 lm LED array along with drivers, </span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14452"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">& have another lot in the post.</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14453"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">The driv<br clear="none"><br clear="none">Sent from my iPad</span></div></div><div id="yiv7752138914yui_3_16_0_1_1441057154792_14454"><div class="yiv7752138914MsoNormal" style="margin-bottom:12.0pt;background:white;"><span style=""><br clear="none">On 1/09/2015, at 4:09 am, Cliff Redus via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:</span></div></div><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt;"><div><div><div><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">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.</span></div></div><div><div class="yiv7752138914MsoNormal" style="background:white;"><span style=""> </span></div></div><div><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">Cliff</span></div></div></div><div><div class="yiv7752138914MsoNormal" style="background:white;"><span style=""> </span></div><div><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">On Mon, Aug 31, 2015 at 8:09 AM, Jon Wallace via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:</span></div><blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in;"><div class="yiv7752138914MsoNormal" style="background:white;"><span style=""><br clear="none">What has happened with the light build?<br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span></div></blockquote></div><div class="yiv7752138914MsoNormal" style="background:white;"><span style=""> </span></div></div></div></blockquote><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt;"><div><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span></div></div></blockquote></div></div></div><div class="yiv7752138914MsoNormal" style="background:white;"><span style=""> </span></div><div id="yiv7752138914yqt00029"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span></div></div><div class="yiv7752138914MsoNormal" style="margin-bottom:12.0pt;background:white;"><span style=""> </span></div></div></div></div></div></div></div></div></div><div class="yiv7752138914MsoNormal" style="background:white;"><span style=""> </span></div><div id="yiv7752138914yqt76460"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span></div></div><div class="yiv7752138914MsoNormal" style="margin-bottom:12.0pt;background:white;"><span style=""> </span></div></div></div></div></div></div></div></div><div class="yiv7752138914MsoNormal" style="background:white;"><span style=""> </span></div><div id="yiv7752138914yqt99533"><div class="yiv7752138914MsoNormal" style="background:white;"><span style="">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span></div></div><div class="yiv7752138914MsoNormal" style="margin-bottom:12.0pt;background:white;"><span style=""> </span></div></div></div></div></div></div></div></blockquote><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt;"><div><div class="yiv7752138914MsoNormal">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></div></div></blockquote></div></div></div></div><br><div class="yqt4850753822" 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