[PSUBS-MAILIST] Light lense

Tue Sep 1 22:38:01 EDT 2015

Hank,all,went & saw a friend who is an expert on LEDs today.He runs 9 million LEDs at a time on sports ground advertising displays,travels to China to buy them etc.He said it would be fine to put the constant current LED driver in the hull & have just the LED in the light housing. He suggested using sheilded cable,as the pulsing current to the LED produces a lot of electrical noise. This isonly required if there is other equipment on board that it might interfere with.   This seems a great way to do it because the driver produces a bit of heat, & it would reduce the effect of conbined heat sources in the one housing.Also the back of the emitter that generates most heat could be heat sinkedstraight on to the back of the light housing. The wiring would have to come in from the side to do this.    He advised backing off the current & not driving them hard if I wanted them to last.He had a commercially available light fitting with a 10,000 lumen emitter in it sitting round(out of water use) it had a huge amount of heat sinks out the back of it.Alan

      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Tuesday, September 1, 2015 11:20 AM
 Subject: Re: [PSUBS-MAILIST] Light lense

Alan,Why can't the driver stay inside the submarine, why put it in the housing?Hank 

  On Monday, August 31, 2015 4:55 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Hank,you have got me thinking. I don't want to pressure compensate because of the capacitorsin the driver. I was also concerned that any fluid might yellow with the heat.According to this article, the main problem with LED lights is disipating the heat that comesout the back of the emmitter.http://www.deepsea.com/wp-content/uploads/article-Application-of-High-Power-LEDs-UI08.pdf
I could seal off the driver compartment at the back of the emmitter & fill that with oil. HoweverI will be machining this out of alluminium rod & can keep the enclosure round the driver pretty smallso there isn't much of an air gap to the housing.Could easily experiment with & without oil to see if it makes much difference.Alan

      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Tuesday, September 1, 2015 10:09 AM
 Subject: Re: [PSUBS-MAILIST] Light lense

Alan,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?Hank 

  On Monday, August 31, 2015 4:00 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Sorry part 2 ( ipad & big fingers)The LED cost $11- & the driver $6-.  Free delivery.I have ordered a number of reflectors for a couple of dollars each.The driver is quite small. With the automated assembly processes& micro sized components, you can't get anywhere near this sizesoldering on the components yourself.Because of the heat factor I am limiting myself to the 6000lm LED.Will be looking at the beam angle I get from these reflectors & available glass lenses, before making up a housing. Looking for a borosilicate lensebecause of the heat transfer & low expansion.I have taken a different route from Ken, but this process he started hasbeen very helpful & motivating, as has been the discussion & informationthat has come out. Alan

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On 1/09/2015, at 9:42 am, Alan <alanlindsayjames at yahoo.com> wrote:

I bought a 24-36V 6000 lm & 4000 lm LED array along with drivers, & have another lot in the post.The driv

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On 1/09/2015, at 4:09 am, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

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.
Cliff
On Mon, Aug 31, 2015 at 8:09 AM, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

What has happened with the light build?
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