<div dir="ltr">Alan<div><br></div><div>I don't have facebook but my wife does. not being familiar with the format, how would I look up your lights?</div><div>my cobs are 1 13/16" X 1 9/16" and about 1/8" thick. What approximate size are yours and how does a flip chip differ from a regular cob? have you had any burn out from getting too hot?</div><div>I am using a dielectric oil in my light housings called Marvel Mystery oil to get around the pressure differential problem but it has a slight color to it so will have to see how the light is effected by that and if it gets any worse from being heated. 10,000 lumens is a lot of light so hopefully they will still be bright enough. I am using oil compensated thrusters as well and I do have small bladders that can expand and contract with heat.</div><div>I bought heat treated lenses from Mcmaster Carr but they were about $22 each and they are glass instead of acrylic. </div><div>Rick</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Dec 29, 2020 at 2:55 PM Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:16px"><div></div>
<div>Hi Rick, </div><div>I posted a couple of pictures of them on the psubs Facebook page. Not sure whether you are on there or not. </div><div>The lights are about 7000lm. Leds are usually around 100lms per Watt. They are rated a bit more but I am under driving them as they get too hot otherwise. </div><div>They are chip on board leds. A technology called "flip chip". I bought them off the manufacturer in China. </div><div>Marine anodizing is thicker, 25 microns. You can get more corrosion protection with hard anodizing. It affords extra protection against galvanic corrosion. </div><div>The buck boost drops or increases the supply voltage to the voltage required for the led. In my case I can connect the driver to anything from 12V to 60V and it increases/reduces it to the 36V required by the led. The driver should also be CC (constant current) as the resistance of the led drops as it heats up & allows a lot more current through. </div><div>I didn't want oil as its messy, & hard to get all the air out. It can also discolour with heat. It's used successfully by lots of people. One technique with oil filling is to have a hose fitting out the back of the light with a pvc tube attached that the wires run down. The tube is pre-crimped so that it collapses easy under pressure & equalises the light fitting. </div><div>I am using glass lenses because acrylic holds the heat in. </div><div>Alan</div><div><br></div><div><br></div>
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On Wednesday, December 30, 2020, 10:37:56 AM GMT+13, Rick Patton via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:
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<div><div id="gmail-m_5334593006160371497ydp29dff9a4yiv7699618871"><div><div dir="ltr">Hi Alan <div><br clear="none"></div><div>Couple of questions</div><div><br clear="none"></div><div>How many lumens are your lights</div><div>What is the source of the light? COB?</div><div>How does marine anodizing differ from just regular anodizing and why do you think that is necessary?</div><div>Is the Buck Buster/LED driver only needed to be able to dim?</div><div>Why did you want to avoid oil?</div><div>Rick</div></div><br clear="none"><div><div id="gmail-m_5334593006160371497ydp29dff9a4yiv7699618871yqt58169"><div dir="ltr">On Tue, Dec 29, 2020 at 10:59 AM Alan James via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br clear="none"></div><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div style="font-family:Helvetica,Arial,sans-serif;font-size:16px"><div></div>
<div>Rick, </div><div>I spent a lot of time on my light project, initially looking for & buying lights & housings on line, that I could adapt. </div><div>I ended up buying 70W leds & making my own housings. The housings I had marine anodized. I had to get an led driver designed & built in China, as I wanted dimming. The driver is a constant current step up, step down (buck boost) that takes a 12-60V input. </div><div>I had the lenses made up in China; 20 for about $2- each. The units were tested to 1000psi. Have used them quite a bit in caves! They get hammered in that instance because they don't have the water cooling & can get very hot. </div><div>Other people have oil filled spot lights used on off road vehicles successfully, but I wanted more of a race car look to my sub & wanted to avoid the oil. </div><div>If a housing or light came up that was suitable & easy to adapt I would use it. </div><div>But bare in mind that most online lights would need marine anodizing. </div><div>Alan </div><div><br clear="none"></div><div><br clear="none"></div>
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On Wednesday, December 30, 2020, 08:08:07 AM GMT+13, Rick Patton via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:
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<div><div id="gmail-m_5334593006160371497ydp29dff9a4yiv7699618871gmail-m_6415325044309590296ydp3e0443cfyiv4495084932"><div dir="ltr">I built my own aluminum exterior light housing, 6 each, using a cob led bulb that was 10,000 lumens, DC 34 volt and about 100 watts. My friend found them online and they were about $3.50 each.<div> I fried a number of them due to poor heat sink or driving them too much and finally got them dialed in. I asked my friend to buy some more and he said that the source in Japan does not sell them any more. </div><div> I found something similar here in the U.S after hours of searching that matched pretty closely to what I had but they were about $38 each. Is anyone using something similar as far as lumens goes that has any sources I could try or is that price about the best I can do?</div><div><br clear="none"><div>Rick</div></div></div></div>_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div>
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